simpleminded

or sim·ple-mind·ed

[ sim-puhl-mahyn-did, -mahyn- ]
/ ˈsɪm pəlˈmaɪn dɪd, -ˌmaɪn- /

adjective

free of deceit or guile; artless or unsophisticated.
lacking in mental acuteness or sense.
mentally deficient.

Origin of simpleminded

First recorded in 1735–45; simple + minded

OTHER WORDS FROM simpleminded

sim·ple·mind·ed·ly, adverb sim·ple·mind·ed·ness, noun

Example sentences from the Web for simple-minded

British Dictionary definitions for simple-minded

simple-minded

adjective

stupid; foolish; feeble-minded
unsophisticated; artless

Derived forms of simple-minded

simple-mindedly, adverb simple-mindedness, noun