1 delinquency, evasion, failure, faithlessness, fault, neglect, negligence, nonperformance, remissness
2 abandonment, abdication, desertion, forsaking, relinquishment, renunciation
English Collins Dictionary - English synonyms & Thesaurus
dereliction If a building or a piece of land is in a state of dereliction, it is deserted or abandoned. n-uncount The previous owners had rescued the building from dereliction.
dereliction of duty
Dereliction of duty is deliberate or accidental failure to do what you should do as part of your job.
He pleaded guilty to wilful dereliction of duty.
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