(n.) Neglect or failure to perform.

Sisyphean labor culpa culpable negligence default delinquency dereliction disconformity disregard endless task failure inadvertence inadvertency inattention inexecution inobservance laches laissez-faire lapse laxity laxness loose ends looseness neglect neglectfulness negligence nonaccomplishment nonachievement nonadherence noncompliance nonconformance nonconformity nonconsummation nondischarging nonexecution nonfeasance nonfulfillment noninterference nonobservance nonrestriction omission overlooking oversight permissiveness poor stewardship procrastination remissness rough edges slackness slight unfulfillment unobservance unrigorousness work of Penelope