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mentally ill
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This shows grade level based on the word's complexity.
adjective
having a mental illness.
noun (used with a plural verb)
Usually the mentally ill . mentally ill persons collectively.
QUIZ
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Question 1 of 9
Which of the following nouns has an irregular plural form?
Origin of mentally ill
First recorded in 1935–40
Words nearby mentally ill
mentalism, mentalist, mentality, mental lexicon, mentally, mentally ill, mental nerve, mental point, mental reservation, mental retardation, mental scotoma
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022