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Failure to perform an act that is an official, contractual, or professional duty.
[C16: from non- + feasance (obsolete) performing or doing, from French faisance, from faire to do, from Latin facere]
failure to perform an act that is part of one's responsibility.
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|Noun||1.||nonfeasance - a failure to act when under an obligation to do so; a refusal (without sufficient excuse) to do that which it is your legal duty to do|
dereliction - willful negligence