All rational antonyms
ra·tion·al
R r adj rational
- senseless — destitute or deprived of sensation; unconscious.
- unwise — not wise; foolish; imprudent; lacking in good sense or judgment: an unwise choice; an unwise man.
- foolish — resulting from or showing a lack of sense; ill-considered; unwise: a foolish action, a foolish speech.
- stupid — lacking ordinary quickness and keenness of mind; dull.
- unintelligent — deficient in intelligence; dull; stupid.
- insane — not sane; not of sound mind; mentally deranged.
- irrational — without the faculty of reason; deprived of reason.
- unsystematic — having, showing, or involving a system, method, or plan: a systematic course of reading; systematic efforts.
- illogical — not logical; contrary to or disregardful of the rules of logic; unreasoning: an illogical reply.
- idiotic — of, relating to, or characteristic of an idiot.
- nonsensical — (of words or language) having little or no meaning; making little or no sense: A baby's babbling is appealingly nonsensical.
- unstable — not stable; not firm or firmly fixed; unsteady.
- agitated — If someone is agitated, they are very worried or upset, and show this in their behaviour, movements, or voice.
- ridiculous — causing or worthy of ridicule or derision; absurd; preposterous; laughable: a ridiculous plan.
- unrealistic — interested in, concerned with, or based on what is real or practical: a realistic estimate of costs; a realistic planner.
- unsound — not sound; unhealthy, diseased, or disordered, as the body or mind.
- unreasonable — not reasonable or rational; acting at variance with or contrary to reason; not guided by reason or sound judgment; irrational: an unreasonable person.
- unbalanced — not balanced or not properly balanced.
- confused — If you are confused, you do not know exactly what is happening or what to do.
- thoughtless — lacking in consideration for others; inconsiderate; tactless: a thoughtless remark.
- careless — If you are careless, you do not pay enough attention to what you are doing, and so you make mistakes, or cause harm or damage.