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.

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Origin of simpleminded

First recorded in 1735–45; simple + minded

OTHER WORDS FROM simpleminded

sim·ple·mind·ed·ly, adverbsim·ple·mind·ed·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for simpleminded

simple-minded

adjective

stupid; foolish; feeble-minded
unsophisticated; artless

Derived forms of simple-minded

simple-mindedly, adverbsimple-mindedness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012