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Meaning of simpleminded

sim•ple•mind•ed

Pronunciation: (sim'pul-mīn'did, -mīn"-), [key]
— adj.
  1. free of deceit or guile; artless or unsophisticated.
  2. lacking in mental acuteness or sense.
  3. mentally deficient.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.