blunder
blun-der
noun
A significant, often embarrassing, mistake caused by carelessness or ignorance.
"The politician made a major blunder during the interview."
verb
To make a serious or foolish mistake, or move clumsily and awkwardly.
"He blundered into the wrong meeting by accident."
Thesaurus
Synonyms: fumble, blurt, blunder out, blurt out, ejaculate, blooper, boo-boo, bloomer, boner, botch, flub, bungle