Insane
/ˌɪˈnseɪn/
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Definition
(adj) Exhibiting unsoundness or disorder of mind; not sane; utterly mad.
Sentence Examples
Hamlet acts as if he were insane.
Are you insane for you to stay up all night playing cards?
CEFR Practice Quiz
Driving at that high speed on a narrow, wet road like this is completely ____ and very dangerous.