American Dictionary

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Definition irrational in American English

irrational adjective

adjective
/ɪˈræʃən(ə)l/
1

done or happening without clear or sensible reasons

Example

irrational violence/fear/panic

Example

The market's enthusiasm for high-tech stocks was irrational but understandable.

Synonyms and related words
1.1

not thinking or behaving in a clear reasonable way

Example

I knew I was being irrational, but when she was late I began to fear the worst.

Synonyms and related words
Definition irrational in American English