simpleminded

or sim·ple-mind·ed

[sim-puhl-mahyn-did, -mahyn-]
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Origin of simpleminded

First recorded in 1735–45; simple + minded
Related formssim·ple·mind·ed·ly, adverbsim·ple·mind·ed·ness, noun

Synonyms for simpleminded

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018