1. See slight. 6, 7. Neglect, dereliction, negligence, remissness imply carelessness, failure, or some important omission in the performance of one's duty, a task, etc. Neglect and negligence are occasionally interchangeable, but neglect commonly refers to an instance, negligence to the habit or trait, of failing to attend to or perform what is expected or required: gross neglect of duty; negligence in handling traffic problems. Dereliction implies culpable or reprehensible neglect or failure in the performance of duty: dereliction in a position of responsibility. Remissness implies the omission or the careless or indifferent performance of a duty: remissness in filing a report on the accident.

Did you mean uncollected?