What is Blundering?

Blundering definition and meaning on Dictionary terms:
a gross, stupid, or careless mistake: That’s your second blunder this morning.

verb (used without object)
to move or act blindly, stupidly, or without direction or steady guidance: Without my glasses I blundered into the wrong room.
to make a gross or stupid mistake, especially through carelessness or mental confusion: Just pray that he doesn’t blunder again and get the names wrong.

verb (used with object)
to bungle; botch: Several of the accounts were blundered by that new assistant.
to utter thoughtlessly; blurt out: He blundered his surprise at their winning the award.