adj. 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