"insane" in the adjective sense
1. insane
afflicted with or characteristic of mental derangement
"was declared insane"
"insane laughter"
2. harebrained, insane, mad
very foolish
"harebrained ideas"
"took insane risks behind the wheel"
"a completely mad scheme to build a bridge between two mountains"
Source: WordNet® (An amazing lexical database of English)
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