Rational Rational synonyms reasonable rational and reasonable sensible rational and sensible intelligent rational and intelligent logical rational and logical sane rational and sane sound rational and sound reasoning rational and reasoning lucid rational and lucid judicious rational and judicious thinking rational and thinking Full list of synonyms (1228) Rational antonyms irrational rational and irrational unreasonable rational and unreasonable illogical rational and illogical insane rational and insane unsound rational and unsound nonsensical rational and nonsensical unintelligent rational and unintelligent senseless rational and senseless foolish rational and foolish incoherent rational and incoherent Full list of antonyms (86) Share this picture Share this image Share this picture Share this image