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irrational

ir·ra·tion·al

irrational

 
pronunciation:
ih rae sh nl
features:
Word Explorer
part of speech: adjective
definition 1: lacking in reason, sense, or judgment.
He had drunk too much whiskey and was now irrational.She had an irrational impulse to jump off the bridge.When his wife went out with her friends, he felt an irrational jealousy.
synonyms:
foolish, unreasonable, unwise
antonyms:
rational, reasonable, thinking
similar words:
absurd, addlebrained, blind, daffy, daft, fantastic, half-baked, idiotic, ill-advised, inane, mad, nonsensical
definition 2: not based on logical reasoning; illogical.
This paper presents an irrational argument.
synonyms:
absurd, fallacious, illogical, invalid, unreasonable, unsound, untenable
antonyms:
logical, rational, reasonable
similar words:
erroneous, incredible, preposterous, ridiculous, specious, unscientific
definition 3: in mathematics, not capable of being expressed as a whole number or as a ratio of two whole numbers.
The square root of two is an irrational number.
derivations: irrationally (adv.), irrationality (n.), irrationalness (n.)
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  emotion, number