insanity - WordReference.com Dictionary of English

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  - inro
  - inroad
  - inrush
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  - insalubrious
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  - insanitary
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insanity

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Concise Oxford English Dictionary © 2008 Oxford University Press:
insane/ɪnˈseɪn/

▶adjective

1 in or relating to an unsound state of mind; seriously mentally ill.

2 extremely foolish; irrational.

– derivatives
insanely adverb,
insanity noun (pl. insanities).

– origin C16: from L. insanus, from in- ‘not’ + sanus ‘healthy’.

'insanity' also found in these Oxford entries:

committee - dementia praecox - insane - lunacy - lunatic - McNaghten rules

Forum discussions with the word(s) "insanity" in the title:

in a fit of temporary insanity

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