insane

play
adjective in·sane \(ˌ)in-ˈsān\

Definition of insane

  1. 1a (1) :  exhibiting a severely disordered state of mind :  affected with mental illness (2) law :  affected with insanity (see insanity 2) criminally insaneb :  unable to think in a clear or sensible way :  crazy insane with jealousy —not used technically

  2. 2 :  used by, typical of, or intended for mentally ill people an insane asylum

  3. 3 :  absurd an insane scheme for making money

  4. 4 :  extreme 1

insanely

adverb

insaneness

play \(ˌ)in-ˈsān-nəs\ noun

Examples of insane in a Sentence

  1. The murderer was found to be criminally insane.

  2. She was insane with jealousy.

  3. He had an insane look in his eyes.

  4. She likes to drive at insane speeds.

  5. He had this insane idea that he could get rich by selling old computers.

Recent Examples of insane from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'insane'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of insane

Latin insanus, from in- + sanus sane



INSANE Defined for Kids

insane

play
adjective in·sane \in-ˈsān\

Definition of insane for Students

  1. 1 :  not normal or healthy in mind

  2. 2 :  used by or for people who are insane an insane asylum

  3. 3 :  very foolish or unreasonable

insanely

adverb

Medical Dictionary

insane

play
adjective in·sane \(ˈ)in-ˈsān\

Medical Definition of insane

  1. 1dated :  exhibiting a severely disordered state of mind

  2. 2:  used by, typical of, or intended for insane persons an insane asylum

insanely

adverb

Law Dictionary

insane

adjective in·sane

Legal Definition of insane

  1. :  affected with insanity



Seen and Heard

What made you want to look up insane? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

the weight of a container

Get Word of the Day daily email!

Test Your Vocabulary

The Emoji Quiz

  • emoji-the-quiz
  • What phase of the moon is this: 🌖 ?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!