insane

US /ɪnˈseɪn/
UK /ɪnˈseɪn/
"insane" picture
1.

in a state of mind which prevents normal perception, behavior, or social interaction; seriously mentally ill.

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The stress of the job almost drove him insane.
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He was declared legally insane and committed to a mental institution.
:
madcrazyderangedlunaticunhinged
2.

extremely foolish or unreasonable.

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It's insane to drive without a seatbelt.
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The prices they are charging are absolutely insane.
:
foolishabsurdridiculouspreposteroussenseless
:
insanityinsanely