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English definition of “certifiable”

certifiable

adjective     /ˈsɜː.tɪ.faɪ.ə.bl̩/ US  /ˈsɝː.t̬ə-/
mentally illOf unsound mindStupid and silly informal behaving in a silly or stupid way: Simon's washing his car again - that man's certifiable!Stupid and sillyOf unsound mind
(Definition of certifiable adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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