- derelict - deserted or abandoned as by an owner; "a derelict ship"
Antonym: unforsaken (indirect, via forsaken)
- derelict, delinquent, neglectful, remiss - failing in what duty requires; "derelict (or delinquent) in his duty"; "neglectful of his duties"; "remiss of you not to pay your bills"
Antonym: diligent (indirect, via negligent)