adverb
- in a stupid or foolish manner; without good sense or judgment
Usage: informal; derived from fathead (noun), meaning a stupid person
Examples
- He fatheadedly agreed to the deal without reading the contract.
- She fatheadedly spent all her savings on a worthless investment.
- The team fatheadedly ignored the coach's strategy and lost the game.
- He fatheadedly drove in the wrong direction for an hour.
- They fatheadedly believed the obvious scam without question.