Webster's English Dictionary

Enter the word to look up:

insane

in.sane \(')in-'sa-n\ \-'sa-n-n*s\ aj [L insanus, fr. in- + sanus sane] 1: 
   exhibiting insanity : MAD  2: used by, typical of, or intended for insane 
   persons  3: FOOLISH, WILD  - in.sane.ly av