Her behavior was deemed non compos mentis by the psychiatrist.
non compos mentis
Frequency:
70
%
The defendant was found to be non compos mentis during the trial.
non compos mentis
Frequency:
60
%
The elderly man's actions were clearly non compos mentis.
Idiomatic Expressions for non compos mentis
Phrase: mad as a hatter
Meaning: to be completely insane
Usage: After hearing his wild conspiracy theories, I'm convinced he's as mad as a hatter, completely non compos mentis.