Absurd

Antonyms of ABSURD

judicious, well-advised, true, indisputable, logical, demonstrable, rational, serious, sensible, valid, clever, solemn, indubitable, bright, consistent, earnest, reasonable, sapient, substantial, brainy, responsible, practical, believable, realistic, undeniable, smart, sound, established, credible, wise, infallible, incontestable, sane, incontrovertible, prudent, certain, demonstrated, unquestionable, sage, conceivable.