insanest

Adjective

insane (comparative more insane or insaner, superlative most insane or insanest)

1. Exhibiting unsoundness or disorder of mind; not sane; utterly mad.
   • What is the cause of insanity? Nobody can answer such a sweeping question as that, but we know that certain diseases, such as syphilis, break down and destroy the brain cells and result in insanity. In fact, about one-half of all mental diseases can be attributed to such physical causes as brain...1933, Dale Carnegie, “Part 1, Chapter 2. THE BIG SECRET OF DEALING WITH PEOPLE”, in How to Win Friends and Influence People, page 41
2. Used by or relating to insane people.
   • an insane hospital
3. 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?c. 1606 (date written), William Shakespeare, “The Tragedie of Macbeth”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount...
4. (informal) Characterized by excess or the utmost folly; ridiculous; impractical.
   • an insane plan
5. (slang) Extremely good; incredibly amazing.
   • That guy is insane at FPS games.
6. (informal) Enraged; furious.