Validity

val·id  (vld)

adj.

1. Well grounded; just: a valid objection.

2. Producing the desired results; efficacious: valid methods.

3. Having legal force; effective or binding: a valid title.

4. Logic

a. Containing premises from which the conclusion may logically be derived: a valid argument.

b. Correctly inferred or deduced from a premise: a valid conclusion.

5. Archaic Of sound health; robust.

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[French valide, from Old French, from Latin validus, strong, from valre, to be strong; see wal- in Indo-European roots.]

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va·lidi·ty, valid·ness n.

valid·ly adv.

Synonyms: valid, sound², cogent, convincing
These adjectives describe assertions, arguments, conclusions, reasons, or intellectual processes that are persuasive because they are well founded. What is valid is based on or borne out by truth or fact or has legal force: a valid excuse; a valid claim.
What is sound is free from logical flaws or is based on valid reasoning: a sound theory; sound principles.
Something cogent is both sound and compelling: cogent testimony; a cogent explanation.
Convincing implies the power to dispel doubt or overcome resistance or opposition: convincing proof.

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Validity 

hold water To be valid, sound, and defensible; to show no inconsistency or deficiency when put to the test. As early as the beginning of the 17th century, this expression was used figuratively of arguments, statements, etc., although both hold and water can be taken literally to describe a vessel or other receptacle’s soundness in retaining a liquid.

Let them produce a more rational account of any other opinion, that will hold water … better than this mine doth. (John French, The York-shire Spaw, 1652)

a leg to stand on Viable proof or justification; something on which to base one’s claims or attitudes. A leg pro vides support and helps to maintain balance. Figuratively this expression is most often heard in the negative not have a leg to stand on, referring to one who fails to support his attitudes or behavior. It is frequently used in legal contexts where an inability to provide proof or justification is pronounced. The still current expression dates from the 16th century.

She hasn’t a leg to stand on in the case. He’s divorcing her, she’s not divorcing him. (M. Spark, Bachelors, 1960)

Thesaurus

Noun	1.	validity - the quality of being valid and rigorous rigour, cogency, rigor believability, credibility, credibleness - the quality of being believable or trustworthy
	2.	validity - the quality of having legal force or effectiveness validness legality - lawfulness by virtue of conformity to a legal statute effect, force - (of a law) having legal validity; "the law is still in effect"
	3.	validity - the property of being strong and healthy in constitution hardiness, lustiness, robustness strength - the property of being physically or mentally strong; "fatigue sapped his strength"

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validity

noun

1. soundness, force, power, grounds, weight, strength, foundation, substance, point, cogency Some people deny the validity of this claim.

2. legality, authority, legitimacy, right, lawfulness They now want to challenge the validity of the vote.

Translations

validity [vəˈlɪdɪtɪ] N (all senses) → validez f

validity [vəˈlɪdəti væˈlɪdəti] n

[contract, document] → validité f

[claim, results, method, argument] → validité f

validity

n

(Jur etc: of document) → (Rechts)gültigkeit f; (of ticket etc) → Gültigkeit f; (of claim) → Berechtigung f

(of argument) → Stichhaltigkeit f; (of excuse etc) → Triftigkeit f; the validity of your objection → Ihr berechtigter or begründeter Einwand; we discussed the validity of merging these two cinematic styles → wir diskutierten, ob es zulässig ist, diese beiden Filmstile zu mischen

validity [vəˈlɪdɪtɪ] n (of document) → validità; (of argument) → fondatezza, validità