adjective
- stupid or slow-witted; lacking intelligence or common sense
Usage: informal; derogatory
Examples
- That was a dunderheaded decision to make without thinking it through.
- He made a dunderheaded mistake by forgetting his passport at home.
- Only a dunderheaded person would believe such an obvious lie.
- The dunderheaded plan fell apart within minutes.
- She called his suggestion dunderheaded and offered a better alternative.
- It was dunderheaded of him to ignore the warning signs.