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noun
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Mishap - An unexpected mistake or error, often not serious but troublesome.
blooper - An embarrassing error
adjective
Erroneous - Misleading or false in belief, statement, or action.
gaffe - An unintentional act or remark causing embarrassment to its originator; a blunder
Mix-up - An error resulting from things being wrongly arranged or identified.
aberration - A departure from what is normal, usual, or expected.
verb
blurt - Say (something) suddenly and without careful consideration
nounverb noun
stumble - An act of stumbling
bobble - To lose one's grip (on a ball)
flunk - Fail to reach the required standard in an examination, test, or course of study
Misconception - A wrong and often widespread assumption based on faulty thinking or lack of information.
boondoggle - Work or activity that is wasteful or pointless but gives the appearance of having value