Difficult and complex logical thought processes, especially when performed effortlessly. / (derogatory) Inventive, complex arguments used to justify what is otherwise unjustifiable.

plural of mental hospital

A mentality according to which an organization or society is divided into a ruling elite and a class of workers treated as inferior, especially along racial lines.

plural of mental asylum

plural of mental block

plural of mental case

The tendency for groups of individuals to act together without planned direction.

(now offensive) intellectually disabled, medically defined as having an IQ (intelligence quotient) below 70 in addition to deficits in two or more adaptive behaviors (which means having problems with basic functional skills that affect everyday, general living).

plural of mental inquest warrant

(chiefly US, law) a court order requested by a citizen to summon an individual for a psychiatric evaluation because of concerns regarding that individual's mental instability