Synonyms:
derelict, delinquent, neglectful, remiss
Meaning: failing in what duty requires; "derelict (or delinquent) in his duty"; "neglectful of his duties"; "remiss of you not to pay your bills"
Usage examples
"Faith! your ladyship must have thought me very remiss," said a voice suddenly, close to her elbow.
He then let it down into the well, and persuaded the Hebrews that God had hearkened to his prayers, and had promised to render the water such as they desired it to be, in case they would be subservient to him in what he should enjoin them to do, and this not after a remiss or negligent manner.