'Non compos mentis' definitions:

Definition of 'non compos mentis'

From: WordNet
adjective
Not of sound mind, memory, or understanding; in law, not competent to go to trial [syn: non compos mentis(p), of unsound mind(p)]

Definition of 'Non compos mentis'

From: GCIDE
  • Non compos \Non com"pos\ Non compos mentis \Non com"pos men"tis\ [L.] Not of sound mind; not having the regular use of reason; hence, also, as a noun, an idiot; a lunatic; one devoid of reason, either by nature or from accident. [1913 Webster]

Synonyms of 'non compos mentis'

From: Moby Thesaurus