1. a gross, stupid, or careless mistake: That’s your second blunder this morning.

verb (used without object)

  1. to move or act blindly, stupidly, or without direction or steady guidance: Without my glasses I blundered into the wrong room.
  2. 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)

  1. to bungle; botch: Several of the accounts were blundered by that new assistant.
  2. to utter thoughtlessly; blurt out: He blundered his surprise at their winning the award.


  1. a stupid or clumsy mistake
  2. a foolish tactless remark

verb (mainly intr)

  1. to make stupid or clumsy mistakes
  2. to make foolish tactless remarks
  3. (often foll by about, into, etc) to act clumsily; stumblehe blundered into a situation he knew nothing about
  4. (tr) to mismanage; botch

mid-14c., “to stumble about blindly,” from a Scandinavian source akin to Old Norse blundra “shut one’s eyes,” from PIE root *bhlendh- (see blind). Meaning “make a stupid mistake” is first recorded 1711. Related: Blundered; blundering.


mid-14c., apparently from blunder (v.), though of about the same age.

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