Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “mental illness”

See all translations

mental illness

noun [C or U] uk   us  
an illness that affects the mind
Translations of “mental illness”
in Korean 정신병…
in Arabic مَرض نَفسي…
in Portuguese doença mental…
in Catalan malaltia mental…
in Japanese 精神障害…
in Italian malattia mentale…
in Chinese (Traditional) 精神病…
in Chinese (Simplified) 精神病…
(Definition of mental illness from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of mental illness?
Add Cambridge dictionaries to your browser to your website

Word of the Day

white Christmas

a Christmas when it snows

Word of the Day

Cleavage proves divisive in Cambridge’s words of 2014

by Alastair Horne,
December 19, 2014
​​​​ Other dictionaries may choose faddish novelties as their words of the year, but here at Cambridge, we like to do something different. We look for the words that have seen sudden surges in searches over the course of the year – words that have been baffling users of English and driven them

Read More 

cinderella surgery noun

December 15, 2014
cosmetic surgery to the feet We have all heard of people having nose jobs, boob jobs and liposuction – but now a new trend growing in popularity in America: Cinderella surgery.

Read More