Definition of insanity in English:


Syllabification: in·san·i·ty
Pronunciation: /inˈsanitē


  • 1The state of being seriously mentally ill; madness: he suffered from bouts of insanity [as complement]: he attempted to plead insanity
    More example sentences
    • In practice, the effect of this strict approach has not been greatly to swell the numbers of people pleading insanity.
    • There's something about this place that breeds great madness and insanity.
    • The trial judge ruled that this was a defence of insanity, whereupon she pleaded guilty and appealed.
    mental illness, madness, dementia; lunacy, instability; mania, psychosis
    informal craziness
  • 1.1Extreme foolishness or irrationality: it might be pure insanity to take this loan the insanities of our time
    More example sentences
    • But the show does capture the various insanities and absurdities of his life, and is filled with clips of his more outrageous outfits.
    • Sarcasm raises its ugly head between all your sacred rites and ceremonies, but you cling on to your methodical insanities.
    • Yet, one has to wonder how National, despite the multitude of Labour insanities, only leads by one point.


late 16th century: from Latin insanitas, from insanus (see insane).

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