having a mental illness.
noun (used with a plural verb)
mentally ill persons collectively (usually preceded by the).
The Magical History Of The Characters’ Names In “Harry Potter”You might be a Harry Potter super-fan, but are you familiar with the fascinating history behind the names of your favorite characters?
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