1. lacking intelligence or common sense; foolish
2. having or showing a lack of complexity; straightforward

Examples

• His simpleminded approach to the problem ignored several important factors.
• She was too simpleminded to recognize the scam.
• The simpleminded solution actually worked better than the complex alternatives.
• Don’t be so simpleminded about politics – the issues are more complicated than that.
• His simpleminded faith in people often led to disappointment.
• The simpleminded design was elegant in its clarity.