View synonyms for insane


[ in-seyn ]


  1. (not in technical use as a medical diagnosis) not sane; not of sound mind; mentally deranged.

    Synonyms: irrational, foolish, maniacal, crazy, crazed, lunatic, demented

  2. of, relating to, or characteristic of a person who is mentally deranged:

    a wild and insane look on her face.

  3. Law. considered to be or to have been affected with insanity, and therefore lacking legal responsibility or legal capacity:

    The judge deemed him criminally insane on the basis of his delusions and hallucinations.

  4. temporarily unable to think clearly:

    I think I'm going insane from all the noise outside.

  5. utterly senseless:

    an insane plan.

  6. Slang. excessive or extravagant; extreme:

    This much snow in April is just insane!

  7. Slang. astonishingly great; wonderful:

    Without his insane performance, the film would've been a total flop.


/ ɪnˈseɪn /


    1. mentally deranged; crazy; of unsound mind
    2. ( as collective noun; preceded by the )

      the insane

  1. characteristic of a person of unsound mind

    an insane stare

  2. irresponsible; very foolish; stupid

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Derived Forms

  • inˈsanely, adverb
  • inˈsaneness, noun

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Other Words From

  • in·sane·ly adverb
  • in·sane·ness noun
  • pseu·do·in·sane adjective

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Word History and Origins

Origin of insane1

First recorded in 1550–60; from Latin insānus “unsound (of mind), demented, frenzied”; in- 3, sane

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Synonym Study

See mad.

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Example Sentences

One question I asked him was whether he considered himself clinically insane.

It was insane how quickly this post spread and people started sharing with each other.

From Eater

To better position your title tag, use high impact, power words like best, exclusive, insane, and so on.

It’s insane to me that I am still told by some nurses that they have to reuse their masks for two weeks.

The sea shanty arose midway through the last millennium as a breed of work-song for sailors to while away the time, forge communal bonds, and generally keep from going insane.

From Fortune

After all, what says Christmas more than obligations, gastrointestinal distress, and insane dining companions?

Yet she spoke of his dignity in such an insane situation and when she touched on his pain she expressed her own on his behalf.

It's insane that you are losing friends in real life because of their ignorance on the Internet.

“It's insane to see what the extreme version of that type of helpless anger combined with mental illness can create,” Cook wrote.

Now we need to change the insane policies that lead to his killing.

After an hour's insane remonstrance, he gave in to his own alarm, rather than to the persuasion of his partner.

The attitude of the nineteenth century upon this point was little short of insane.

Some corporations are still denied voluntary action, as well as minors and insane persons.

It is not quite so easy to state rules that apply to insane persons because their conditions vary so greatly.

And again when an insane man has made a contract, the relief to which he is entitled depends on circumstances.





ins and outsinsanitary