adjective

in a very poor condition as a result of disuse and neglect.

a derelict Georgian mansion

dilapidated,ramshackle,run down,broken-down,worn out,tumbledown,in (a state of) disrepair,in ruins,ruined,falling to pieces,falling apart,rickety,creaky,creaking,decrepit,deteriorating,crumbling,deteriorated,neglected,untended,unmaintained,gone to rack and ruin,gone to seed,on its last legs,the worse for wear,disused,abandoned,deserted,discarded,rejected,forsaken,cast off,relinquished,ownerless

noun

a person without a home, job, or property.

derelicts who could fit all their possessions in a paper bag

tramp,vagrant,vagabond,down and out,homeless person,drifter,knight of the road,beggar,mendicant,outcast,pariah,ne’er do well,good-for-nothing,wastrel,streety,dosser,bag lady,hobo,bum,derro