Lacking in subtlety or sophistication; artless or naive: a simple-minded horror movie; simple-minded generalizations. (adjective)
Stupid or silly; foolish.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "simple-minded" in a sentence
"Newsweek described him as “fighting mad,” tired of “being characterized as a simple-minded has-been.”"
"That raising children is old-fashioned and simple-minded."
"A simple-minded target, easily over-taken and dominated."