boneheadedness
/ˈboʊnˌhɛdɪdnəs/
noun
- The quality or state of being stupid or foolish; extreme stubbornness or lack of intelligence.
- She couldn't believe the boneheadedness of the driver who ran a red light in heavy traffic.
- The project failed because of the manager's boneheadedness in refusing to listen to expert advice.
- His boneheadedness cost the team the game when he ignored the coach's instructions.
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