(idiomatic) A state of illness, or bad health.

Having a psychological disorder.

(uncountable, psychiatry) The property of being mentally ill; mental disorders taken as a whole. / (countable, psychiatry) A mental disorder.

Poorly defined; blurry, out of focus; lacking a clear boundary. / (mathematics) Defined in an inconsistent way.

present participle of ill-treat

simple past tense and past participle of ill-treat

Third-person singular simple present indicative form of ill-treat

plural of mental illness

(law) Abbreviation of United States District Court for the Northern District of Illinois, as used in case citations.

(law) Abbreviation of United States District Court for the Central District of Illinois, as used in case citations.