having a mental illness.
noun (used with a plural verb)
mentally ill persons collectively (usually preceded by the).
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for mentally ill
Sometimes the question is how mentally-ill people got access to guns.In Between Mass Shootings, the Media Have Been MIA on Guns|Howard Kurtz|December 17, 2012|DAILY BEAST