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insane

in·sane [ in sáyn ]


adjective 
Definition:
 
1. legally considered as psychiatrically disordered: considered legally incompetent or irresponsible because of a psychiatric disorder

2. lacking reasonable thought: showing a complete lack of reason or foresight ( informal )



plural noun 
Definition:
 
people legally considered as psychiatrically disordered: people who are considered legally incompetent or irresponsible because of a psychiatric disorder ( dated )

[Mid-16th century. < Latin insanus< sanus "healthy, sane"]

in·sane·ly adverb
in·sane·ness noun
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