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simpleminded

or sim·ple-mind·ed

[sim-puh l-mahyn-did, -mahyn-]
See more synonyms for simpleminded on Thesaurus.com
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

See more synonyms for simpleminded on Thesaurus.com
2, 3. stupid, foolish, slow, dull-witted, half-witted.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for simpleminded

Historical Examples

  • A beautiful, simpleminded creature—it was what he was, you can depend on that.

    Sketches New and Old, Complete

    Mark Twain (Samuel Clemens)

  • Would he have risked it, had he not been the most simpleminded of men?

  • A beautiful, simpleminded creature it was what he was, you can depend on that.

    Sketches New and Old, Part 6.

    Mark Twain (Samuel Clemens)

  • And his simpleminded, untravelled, wonderloving auditor or auditors received his words literally.

  • Nothing had the girls (or the simpleminded 11 country Doctor who sped them) known of the dangers or pitfalls of the city.

    Orphans of the Storm

    Henry MacMahon