insane

Meanings

1. 1
   adj

   Seriously mentally ill.

   The man was declared legally insane.

2. 2
   adj

   Extremely foolish or unreasonable.

   Driving in this storm would be insane.

3. 3
   adj

   Extremely good or impressive.

   That guitar solo was absolutely insane.

From Latin īnsānus (“unsound in mind; mad, insane”), from in- + sānus (“sound, sane”), equivalent to in- + sane.

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