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mentally deficient

ADJECTIVE

unintelligent

Synonyms

WEAK

brainless deficient dense doltish dumb empty-headed foolish half-witted idiotic imbecilic inane meaningless mindless moronic not intelligent pointless senseless simple simpleminded slow thick-headed unthinking witless

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Lennox Castle itself was built in the 1830s but it was not until a century later that it opened as Glasgow corporation's hospital for "mentally deficient" people.

From BBC • Jan. 6, 2022

Between 1966 and 1971, about 350,000 draftees were overweight, physically impaired, mentally deficient, or had criminal records.

From Salon • Aug. 15, 2018

He seems to have been sullen, and perhaps mentally deficient, with a strong, and even daring temper.

From Slate • Aug. 11, 2018

Mr. Hernandez’s former wife, Daisy Rivera, also said he never appeared to her to be mentally deficient or delusional, though she portrayed him as a strong-willed and controlling husband.

From New York Times • Mar. 8, 2015

Both Call and the Captain seemed to regard me as mentally deficient, since I couldn’t appreciate their marvelous humor.

From "Jacob Have I Loved" by Katherine Paterson