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simpleminded

or sim·ple-mind·ed

[sim-puh l-mahyn-did, -mahyn-]
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adjective
  1. free of deceit or guile; artless or unsophisticated.
  2. lacking in mental acuteness or sense.
  3. mentally deficient.
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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

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2, 3. stupid, foolish, slow, dull-witted, half-witted.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018