irrationaladjective
uk/ɪˈræʃ.ən.əl/us/ɪˈræʃ.ən.əl/C2 not using reason or clear thinking:
It's totally irrational, but I'm frightened of mice.
His parents were worried by his increasingly irrational behaviour.
Thesaurus: synonyms and related words
Of unsound mind
- around the bend idiom
- bat
- batshit
- battle-scarred
- beside
- disturbed
- fruitcake
- gaga
- loon
- lose
- mad
- maniac
- nutcase
- off your trolley idiom
- psychopath
- schizo
- screwy
- trolley
- unhinged
- wreck
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irrationally
adverb uk/ɪˈræʃ.ən.əl.i/us/ɪˈræʃ.ən.əl.i/
People often behave irrationally when they are under stress.
irrationality
noun [ U ] uk/ɪˌræʃ.ənˈæl.ə.ti/us/ɪˌræʃ.ənˈæl.ə.t̬i/