blundering
adjective
[ ˈblʌndərɪŋ ]
• making or characterized by stupid or careless mistakes; clumsy.
• "both her parents are supportive, if a bit blundering"
blunder
verb
• make a stupid or careless mistake; act or speak clumsily.
• "he knew he'd blundered"
Similar:
make a mistake,
be mistaken,
err,
be in error,
misjudge,
miscalculate,
bungle,
trip up,
be wrong,
get something wrong,
be wide of the mark,
slip up,
screw up,
blow it,
foul up,
goof,
put one's foot in it,
make a boo-boo,
fuck up,
bugger up,
drop a brick,
boob,
Origin:
Middle English: probably of Scandinavian origin and related to blind.