1
as in psychotic
having or showing a very abnormal or sick state of mind
only an insane person would intentionally jump off a skyscraper
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2
as in absurd
conceived or made without regard for reason or reality
a completely insane plan to build an opera house in the middle of nowhere
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3
as in stupid
showing or marked by a lack of good sense or judgment
an insane plan to blow all of their savings on lottery tickets
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4
as in excessive
going beyond a normal or acceptable limit in degree or amount
wanted an insane amount of money to paint our house
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Merriam-Webster unabridged
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