Synonyms of valid

1 Syllable

sound, real, just, goer, strong, true, pure, goest, reals, good

2 Syllables

lawful, tested, surer, legal, potent, surest, actuals, proven, jural, cogent, solid, telling, realer, binding, legit, stringent, weighty, for-sure, sure-thing, realest, factual, kosher, rightful, trustier

3 Syllables

credible, trustable, consular, usable, logical, authentic, veracious, official, powerful, substantial, effectual, well-grounded, plausible, watertight, convincing, forcible, contractual, card-carrying, meaningful, confirmed, efficient, trustworthy, attested, compelling, witnessed, well-founded

4 Syllables

suasive, conclusive, uncorrupted, original, ultimate, condonable, vindicable, consumable, verifiable, unmannered, enforcible, precedented, warrantable, effective, persuasive, defensible, remissible, significant, reasonable, juridicious, justifiable, extensional, convictive, honest-to-god, really-truly, efficacious, unrefuted, accurate, problem-solving

5 Syllables

satisfactory, undeceptive, utilizable, irrefutable, irradicable, unanswerable, well-organized, analytical, legitimate

6 Syllables

ratiocinative, authoritative, ineradicable, unadulterated, determinative