(ˈ)in|sān, ənˈs- adjective
( sometimes -er/-est )
Etymology: Latin insanus, from in- in- (I) + sanus sane
1.
a. obsolete , of the mind : unsound , disordered
b. of a person : exhibiting unsoundness or disorder of mind : affected with insanity : mad ; especially : disordered in mind to such a degree as to be unable to function safely and competently in ordinary human relations — compare psychotic
2. obsolete : causing insanity
3. : used by, typical of, or for insane persons
an insane hospital
insane ravings
4. : utterly foolish or ridiculous : lacking any logical or practical basis : wildly visionary
a perfectly insane idea
such insane extravagance
the insanest thing you ever saw
• in·sane·ness -ānnə̇s noun