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Definition of insanity:

  1. Such a mental condition, as, either from the existence of delusions, or from incapacity to distinguish between right and wrong, with regard to any matter under action, does away with individual responsibility.
  2. The state of being insane; unsoundness or derangement of mind; madness; lunacy.


foolishness, folly, insaneness, aberration, psychopathy, unbalance, disease, brainsickness, foolhardiness, sane, idiocy, stupidity, nonsense, foolery, monomania, ability, senselessness, absurdity, alienation, tomfoolery, silliness, imbecility, zaniness, disturbance, mental illness, complex, phobia, preposterousness.

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