insane

adjective6

1. •
   Exhibiting unsoundness or disorder of mind; not sane; utterly mad.

   • And you told me not to drive But I made it home alive So you said that only proves that I'm insane — 1980
2. •
   (informal) very foolish and not at all reasonable

   • Yenshui is a fairly ordinary town situated between Tainan and Chiayi. However, during the Lantern Festival, on the 15th day of the first moon, the whole town goes insane. — 1998
3. •
   (slang) Extremely good; incredibly amazing.

   • That guy is insane at FPS games.
4. •
   Used by or relating to insane people.
5. •
   (informal) Enraged; furious.
6. •
   Causing insanity or madness.

   • Were such things here, as we doe speake about? / Or haue we eaten on the insane Root, / That takes the Reason Prisoner? — 1606