blun·der (blŭn'dər) n. A usually serious mistake typically caused by ignorance or confusion. v.
blun·dered, blun·der·ing, blun·ders
v.
intr.
To move clumsily or blindly.
To make a usually serious mistake.
v.
tr.
To make a stupid, usually serious error in; botch.
To utter (something) stupidly or thoughtlessly.
[From Middle English blunderen, to go blindly, perhaps from Old Swedish blundra, have one's eyes closed, from Old Norse blunda.] blun'der·er n., blun'der·ing·ly adv.
Synonyms: These verbs mean to move awkwardly or unsteadily: blundered about the dark room; flies bumbling against the screen; floundered up the muddy trail; a wagon lumbering along an unpaved road; twisted her ankle and lurched home; stumbled but regained his balance.
[bluhn-der] 
