Also found in: Thesaurus, Medical, Legal, Idioms, Encyclopedia, Wikipedia.
Related to reasonable: reasonable care, Reasonable person standard


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.


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


(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.


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.
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"


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.


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:
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


[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


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


[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...


(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.


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


a. razonable; justificado-a; sensato-a;
___ carecuidado justificado;
___ chargehonorarios ___ -s;
___ costcosto ___.
References in classic literature ?
Aunt March saw that she had begun wrong, and after a little pause, made a fresh start, saying as mildly as she could, "Now, Meg, my dear, be reasonable and take my advice.
Shimerda grew more calm and reasonable before our visit was over, and, while Antonia translated, put in a word now and then on her own account.
Pontellier once more seated himself with elevated feet, and after a reasonable interval of time smoked some more cigars.
However, as flesh and blood are not always the same, it is quite reasonable to suppose that the gentle ones are willing to rest, after all they have seen and done this day.
I tried to have a real earnest reasonable talk with him the other day, and tell him how I wish he would let me go and make a visit to Cousin Henry and Julia.
But the story would include a chain of events extending over the better part of two centuries, and, written out with reasonable amplitude, would fill a bigger folio volume, or a longer series of duodecimos, than could prudently be appropriated to the annals of all New England during a similar period.
Indeed, so far as its physical aspect is concerned, with its flat, unvaried surface, covered chiefly with wooden houses, few or none of which pretend to architectural beauty -- its irregularity, which is neither picturesque nor quaint, but only tame -- its long and lazy street, lounging wearisomely through the whole extent of be peninsula, with Gallows Hill and New Guinea at one end, and a view of the alms-house at the other -- such being the features of my native town, it would be quite as reasonable to form a sentimental attachment to a disarranged checker-board.
Balt Van Tassel was an easy indulgent soul; he loved his daughter better even than his pipe, and, like a reasonable man and an excellent father, let her have her way in everything.
But it was not in reasonable nature that a man so organized, and with such terrible experiences and remembrances as he had; it was not in nature that these things should fail in latently engendering an element in him, which, under suitable circumstances, would break out from its confinement, and burn all his courage up.
At any rate, if we yield to it, we must grant a far greater age to the Right Whale than at first glance will seem reasonable.
I prefer a loose rein myself, and his lordship is always very reasonable about horses; but my lady -- that's another thing; she will have style, and if her carriage horses are not reined up tight she wouldn't look at them.
Fortunately, the policeman is disposed to be reasonable, and so it is not Marija who is flung out of the place.