Irrational
/ˌɪˈræʃənəl/
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Definition
(adj) Not rational; unfounded, nonsensical or wrong-headed.
Sentence Examples
The irrational conversation continued.
Clava loves all things irrational, and works at the kindergarten for precisely that reason.
CEFR Practice Quiz
The fear of spiders is often ____, as most spiders are completely harmless to healthy human beings.