a stupid unnecessary mistake
move about uncertainly
make foolish mistakes
"I blundered during the job interview"
"He fumbled towards the door"
"He blurted out the secret"
"He blundered his stupid ideas"
He felt as if he had blundered into a party given by a complete stranger.
出自： J. B. Priestley
Someone behind him, blundering through the undergrowth.
出自： B. Bainbridge