'Simple-minded' definitions:

Definition of 'simple-minded'

(from WordNet)
adjective
Lacking subtlety and insight; "a simple-minded argument"
adjective
Lacking mental capacity and subtlety [syn: dim-witted, simple, simple-minded]

Definition of 'Simple-minded'

From: GCIDE
  • Simple-minded \Sim"ple-mind`ed\, a. Artless; guileless; simple-hearted; undesigning; unsuspecting; devoid of duplicity. --Blackstone. -- {Sim"ple-mind`ed*ness}, n. [1913 Webster]