valid

modif.

1. Capable of proof

   sound, cogent, logical, conclusive, solid, well-grounded, well-founded, tested, accurate, convincing, telling, correct, determinative, compelling, persuasive, potent, stringent, strong, ultimate, unanswerable, irrefutable.

   Antonyms wrong*, erring*, misleading.

2. Genuine

   true, original, factual, real, actual, pure, uncorrupted, authentic, confirmed, authoritative, trustworthy, credible, attested, efficient, efficacious, legitimate, adequate, substantial, proved, proven, unalloyed, unadulterated.

   Antonyms false*, fictitious*, counterfeit.

valid applies to that which cannot be objected to because it conforms to law, logic, the facts, etc. a valid criticism, a valid license; sound refers to that which is firmly grounded on facts, evidence, logic, etc. and is therefore free from error a sound method, a sound argument; cogent implies such a powerful appeal to the mind as to appear conclusive cogent reasoning; convincing implies such validity as to persuade or overcome doubts or opposition a convincing performance; telling suggests the power to have the required effect by being forcible, striking, relevant, etc. a telling rejoinder