Dictionary.com
definitions

mentally ill

See more synonyms for mentally ill on Thesaurus.com
adjective
  1. having a mental illness.
noun (used with a plural verb)
  1. mentally ill persons collectively (usually preceded by the).
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for mentally ill

cracked, crazed, crazy, cuckoo, daft, demented, deranged, insane, loco, loony, lunatic, mad, nuts, nutty, paranoid, psycho, psychopathic, psychotic, touched, unbalanced

Examples from the Web for mentally ill

Contemporary Examples of mentally ill