The Oxford Thesaurus An A-Z Dictionary of Synonyms - derelictadj.

1) deserted, abandoned, forsaken, neglected; ruined, dilapidated, run-down, tumbledown: The council has a scheme for the renovation of derelict buildings in the inner city. 2) negligent, remiss, neglectful, delinquent, dilatory, careless, heedless, lax, slack, irresponsible, slipshod, slovenly, Colloq sloppy: He was accused of having been derelict in his duty. --n. 3) vagrant, tramp, outcast, pariah, loafer, wastrel, good-for-nothing, ne'er-do-well, malingerer, vagabond, slacker, down-and-out, US and Canadian hobo, Colloq US bum: Because of alcohol, he ended up as a derelict.