malpractice
noun
mal·prac·tice
ˌmal-ˈprak-təs
1
: a dereliction of professional duty or a failure to exercise an ordinary degree of professional skill or learning by one (such as a physician) rendering professional services which results in injury, loss, or damage
2
: an injurious, negligent, or improper practice : malfeasance
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Merriam-Webster unabridged
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