adjective
authentic, valid, legal
Synonyms: accepted, accredited, acknowledged, admissible, appropriate, authorized, canonical, certain, cogent, consistent, correct, customary, fair, genuine, innocent, just, justifiable, lawful, licit, logical, natural, normal, official, on the level, on the up and up, orthodox, probable, proper, real, reasonable, received, recognized, regular, reliable, rightful, sanctioned, sensible, sound, statutory, sure, true, typical, usual, verifiable, warranted, well-founded
Antonyms: illegal, illegitimate, invalid, unlawful, unwarranted