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ir·ra·tion·al
 irrational
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- pronunciation:
- ih
rae
sh
n l
- features:
- Word Combinations (adjective), Word Explorer, Word Parts
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
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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
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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. |
related words: |
arbitrary, groundless, neurotic, senseless, stupid, unsound, wanton |
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derivations: |
irrationally (adv.), irrationality (n.), irrationalness (n.) |
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