insanity Webster insanity insanity http://www.merriam-webster.com/dictionary/insanity Sisters insanity dictionary defines “insanity” http://www.merriam-webster.com/dictionary/insanity insanity insanity Insanity Insanity Merriam-Webster’s dictionary http://www.merriam-webster.com/dictionary/insanity in·san·i·ty Merriam-Webster online Examples: insanity in a sentence insanity merriam-webster Webster's online and look up the definition of insanity insanity insanity It’s not by the way insanity Insanity "utter foolish[ness]."