irrational

US /ɪˈræʃənəl/

UK /ɪˈræʃənl/

B2
adj.AdjectiveNot sensible or reasonable; illogical
It is clear he made an irrational decision because he decided without thinking clearly about the issue
adj.AdjectiveA real number that cannot be expressed as a ratio of two integers.
Pi is an irrational number.

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