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1. Capable of reasoning; rational: a reasonable person.
2. Governed by or being in accordance with reason or sound thinking: a reasonable solution to the problem.
3. Being within the bounds of common sense: arrive home at a reasonable hour.
4. Not excessive or extreme; fair: reasonable prices.

rea′son·a·bil′i·ty, rea′son·a·ble·ness n.
rea′son·a·bly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. showing reason or sound judgment
2. having the ability to reason
3. having modest or moderate expectations; not making unfair demands
4. (Commerce) moderate in price; not expensive
5. fair; average: reasonable weather.
ˈreasonably adv
ˈreasonableness n
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈri zə nə bəl, ˈriz nə-)

1. agreeable to or in accord with reason; logical.
2. not exceeding the limit prescribed by reason; not excessive: reasonable terms.
3. moderate, esp. in price; not expensive.
4. endowed with reason.
5. capable of rational behavior, decision, etc.
[1250–1300; Middle English resonable < Middle French raisonnable < Latin ratiōnābilis]
rea′son•a•ble•ness, n.
rea′son•a•bly, adv.
syn: See moderate.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


1. 'reasonable'

When someone is reasonable, they behave in a fair and sensible way.

Our mother was always very reasonable.
I can't do that, Morris. Be reasonable.

If something such as a proposal or judgement is reasonable, it is acceptable because it is fair or sensible.

Rules and procedures need to be accepted as reasonable by those who operate them.
There was no reasonable explanation for her decision.
2. 'rational'

You say that someone is rational when they are able to think clearly and make decisions and judgements based on reason rather than emotion.

Let's talk about this like two rational people.

You can also describe people's behaviour as rational.

This was a totally rational response to a set of complex problems.
Collins COBUILD English Usage © HarperCollins Publishers 1992, 2004, 2011, 2012
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.reasonable - showing reason or sound judgment; "a sensible choice"; "a sensible person"
fair, just - free from favoritism or self-interest or bias or deception; conforming with established standards or rules; "a fair referee"; "fair deal"; "on a fair footing"; "a fair fight"; "by fair means or foul"
logical - capable of or reflecting the capability for correct and valid reasoning; "a logical mind"
rational - consistent with or based on or using reason; "rational behavior"; "a process of rational inference"; "rational thought"
valid - well grounded in logic or truth or having legal force; "a valid inference"; "a valid argument"; "a valid contract"
unreasonable - not reasonable; not showing good judgment
2.reasonable - not excessive or extreme; "a fairish income"; "reasonable prices"
moderate - being within reasonable or average limits; not excessive or extreme; "moderate prices"; "a moderate income"; "a moderate fine"; "moderate demands"; "a moderate estimate"; "a moderate eater"; "moderate success"; "a kitchen of moderate size"; "the X-ray showed moderate enlargement of the heart"
3.reasonable - marked by sound judgment; "sane nuclear policy"
rational - consistent with or based on or using reason; "rational behavior"; "a process of rational inference"; "rational thought"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


3. within reason, fitting, fit, appropriate, sensible, proper It seems reasonable to expect rapid urban growth.
within reason impossible
4. low, cheap, competitive, moderate, modest, inexpensive, tolerable, within your means His fees were quite reasonable.
5. average, fair, moderate, modest, tolerable, O.K. or okay (informal) The boy answered him in reasonable French.
Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002


1. Consistent with reason and intellect:
2. Possessing, proceeding from, or exhibiting good judgment and prudence:
3. Kept within sensible limits:
4. Not excessive or extreme in amount, degree, or force:
5. Suited to or within the means of ordinary people:
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
عاقِل، رشيدمُرْضٍ، مَقْبولمَعْقولمَعْقُولمَقْبول، مَعْقول
이치에 맞는
biết điều


[ˈriːznəbl] ADJ
1. (= sensible, fair) [person, decision, explanation, request] → razonable; [behaviour] → sensato
I kept my voice calm and reasonablemantuve un tono de voz calmado y de persona razonable
be reasonable!¡sé razonable!
it is reasonable to suppose thates razonable suponer que ...
beyond (a or any) reasonable doubtsin que quede lugar a dudas
to use reasonable force (Jur) → hacer uso moderado de la fuerza
reasonable groundsmotivos mpl fundados
within a reasonable timedentro de un plazo de tiempo razonable
2. (= acceptable) [amount, distance, price, offer] → razonable; [standard, results] → aceptable
there was a reasonable chance of finding a peaceful solutionexistían bastantes posibilidades de encontrar una solución pacífica
this suit is very reasonableeste traje no es nada caro or no está nada mal de precio
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005


[ˈriːzənəbəl] adj
(= sensible) [person, decision, behaviour] → raisonnable
Be reasonable! → Sois raisonnable!
(= acceptable) [offer, explanation] → raisonnable
it is reasonable to assume that ... → on peut raisonnablement supposer que ... reasonable doubt
(= moderate) [price, rates] → raisonnable
[amount, number] → assez grand(e)
(= fairly good) [standard, quality] → acceptable
He wrote a reasonable essay → Sa dissertation était correcte.
to have a reasonable chance of doing sth → avoir d'assez bonnes chances de faire qchreasonable doubt ndoute m raisonnable
beyond reasonable doubt → au-delà de tout doute raisonnable degré de certitude permettant à un jury de prononcer le verdict de culpabilité
Collins English/French Electronic Resource. © HarperCollins Publishers 2005


vernünftig; chancereell; claimberechtigt; amountangemessen; (= acceptable) excuse, offerakzeptabel, angemessen; be reasonable!sei vernünftig; vegetables are reasonable (in price) just nowGemüse ist momentan preiswert; to be reasonable about somethingangemessen reagieren auf etw, vernünftig sein in einer Sache (dat); to use reasonable force (Jur) → angemessene Gewalt anwenden; reasonable grounds (Jur) → zureichende Gründe pl; reasonable doubtberechtigter Zweifel; beyond (all) reasonable doubtohne (jeden) Zweifel; guilty beyond (all) reasonable doubt (Jur) → hinreichend schuldig; within a reasonable timeinnerhalb eines angemessenen Zeitraums; it would be reasonable to assume that …man könnte durchaus annehmen, dass …
(= quite good)ordentlich, ganz gut; his work was only reasonableseine Arbeit war nur einigermaßen (gut); with a reasonable amount of luckmit einigem Glück
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007


[ˈriːznəbl] adj (person, price) → ragionevole; (behaviour, decision) → sensato/a; (standard) → accettabile
a perfectly reasonable thing to do → una cosa perfettamente sensata da farsi
it is reasonable to conclude that ... → si può logicamente concludere che...
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995


(ˈriːzn) noun
1. something which makes something happen, describes why it happened, should happen or is going to happen etc. What is the reason for this noise?; What is your reason for going to London?; The reason (why) I am going is that I want to.
2. the power of the mind to think, form opinions and judgements etc. Only man has reason – animals have not.
1. to (be able to) think, form opinions and judgements etc. Man alone has the ability to reason.
2. to argue; to work out after some thought. She reasoned that if he had caught the 6.30 p.m. train, he would not be home before 8.00.
ˈreasonable adjective
1. sensible. a reasonable suggestion.
2. willing to listen to argument; acting with good sense. You will find him very reasonable.
3. fair; correct; which one should or could accept. Is $10 a reasonable price for this book?
4. satisfactory; as much as one might expect or want. There was a reasonable number of people at the meeting.
ˈreasonableness noun
ˈreasonably adverb
He behaved very reasonably; The car is reasonably priced; The meeting was reasonably well attended.
ˈreasoning noun
the act or process of reaching a decision, conclusion etc. I don't understand his reasoning at all.
have reason to (believe/think etc)
to feel justified in (believing etc). I have (good) reason to think that he is lying.
it stands to reason
it is obvious or logical. If you go to bed so late it stands to reason that you will be tired next morning.
listen to reason
to allow oneself to be persuaded to do something more sensible than what one was going to do; to pay attention to common sense.
lose one's reason
to become insane.
reason with
to argue with (a person) in order to persuade him to be more sensible. We tried to reason with the worried mother but she went out alone in the storm to look for the child.
see reason
to (be persuaded to) be more sensible than one is or has been.
within reason
within the limits of good sense. I'll do anything / go anywhere within reason.
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.


مَعْقُول rozumný fornuftig vernünftig εύλογος razonable järkevä raisonnable razuman ragionevole 理にかなった 이치에 맞는 redelijk rimelig rozsądny razoável разумный skälig ที่มีเหตุผล mantıklı biết điều 合理的
Multilingual Translator © HarperCollins Publishers 2009


a. razonable; justificado-a; sensato-a;
___ carecuidado justificado;
___ chargehonorarios ___ -s;
___ costcosto ___.
English-Spanish Medical Dictionary © Farlex 2012
References in classic literature ?
I see faces, keen and bright; others dull or dangerous; others, unsteady, insincere,--none that have the calm authority of a reasonable soul.
"I won't be reasonable--I can't be reasonable--I AM reasonable. It is you who are unreasonable.
There -- I have saved you the trouble of accounting for it; and really, all things considered, I begin to think it perfectly reasonable. To be sure, you knew no actual good of me -- but nobody thinks of that when they fall in love."
"I've got your name, an' here's your number--I got that, too: HIGH-STRUNG BUT REASONABLE. It fits you like the paper on the wall.
it is unworthy of a reasonable being, it is doubting the mercy of God, to say what you have just said.
A CAT caught a Cock, and pondered how he might find a reasonable excuse for eating him.
"My good friends," said the patient, awakened by the noise of the dispute, and apprehending the cause of it, "pray be more reasonable. If I could for weeks endure you both, can you not for a little while endure each other?
This being indeed the means which they use to recompense to themselves their extreme servility and condescension to their superiors; for nothing can be more reasonable, than that slaves and flatterers should exact the same taxes on all below them, which they themselves pay to all above them.
He told me, he did not doubt, that, in eight years more, he should be able to supply the governor's gardens with sunshine, at a reasonable rate: but he complained that his stock was low, and entreated me "to give him something as an encouragement to ingenuity, especially since this had been a very dear season for cucumbers." I made him a small present, for my lord had furnished me with money on purpose, because he knew their practice of begging from all who go to see them.
"Yes, dear friend," Athos replied, "but you said a word the other day that was more than reasonable -- it was noble and generous.
Cuthbert to undertake their defence and bring her round to a reasonable view of things.
For the hereditary prince has less cause and less necessity to offend; hence it happens that he will be more loved; and unless extraordinary vices cause him to be hated, it is reasonable to expect that his subjects will be naturally well disposed towards him; and in the antiquity and duration of his rule the memories and motives that make for change are lost, for one change always leaves the toothing for another.