non compos mentis

Of unsound mind

Non compos mentis is a Latin legal term meaning "not of sound mind." It describes someone who lacks the mental capacity to manage their own affairs, make valid contracts, or stand trial.

The phrase appears in legal contexts where mental competency matters: The court found the defendant non compos mentis and unfit to proceed.

In casual use, it can humorously describe someone acting crazy or out of it.

archaic

lunacy

Extreme irrational foolishness

unsound · bedlam · asylum · lunatic · alienist · moonstruck · raving · unhinged · distracted · out of one's mind

psychiatric

psychosis

Severe reality detachment

dementia · delirium · bipolar · mania · paranoia · dissociation · catatonia · cognitive impairment · Alzheimer's · neurodegenerative

legal

guardianship

Legal care of another

unsound mind · adjudication · mental capacity · insanity defense · committal · ward · fiduciary · power of attorney · lucid interval · mental competence

incapacity

confusion

Mental disorientation or bewilderment

unconsciousness · inebriation · intoxication · delirium tremens · altered state · unresponsive · stupefaction · impairment · debility · infirmity

Categories
Opposites
mental competence

non compos mentiscompos mentis

Mentally competent, legally speaking

of sound mind · sane · competent · in one's right mind · rational

lucidity and clarity of mind

non compos mentislucid

Mentally sharp and comprehensible

compos mentis · clear-headed · clearheaded · sharp · alert

Family

composure, incompetent, incapacity, incompetence, compos mentis

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Used worldwide · Timeless · Abstract · Negative · Rated PG