16 entries under idiom topic. ×

12
of unsound mind(expression, adjective, law, foolish)
7
not all there(expression, adjective, law, unstable)
5
out to lunch(expression, adjective, unstable, disturbed)
2
off one's rocker(adjective, law, sane)
1
around the bend(adjective, law, sane)
1
bereft of reason
1
deprived of reason
1
in the ozone(expression, crazy, hysterical, psychotic)
1
nutty as a fruitcake(expression, adjective, law, crazy)
1
stark raving mad(adjective, law, sane)
0
crazy as a loon(adjective, law, sane)
0
mad as a hatter(adjective, law, sane)
0
nutty as fruitcake(expression, crazy, hysterical, psychotic)
0
off one's head(adjective, law, sane)
0
out of one's mind(adjective, law, sane)
0
sick in the head(adjective, law, sane)
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APASmart Define. (2015). non compos mentis thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/non_compos_mentis/thesaurus/synonyms
ChicagoSmart Define. 2015. "non compos mentis thesaurus" https://smartdefine.org/non_compos_mentis/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, non compos mentis thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/non_compos_mentis/thesaurus/synonyms>.
MLASmart Define. "non compos mentis thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/non_compos_mentis/thesaurus/synonyms>