Definition of derelicts:
(adj) :
Given up by the guardian or owner; abandoned, forsaken.
(adj) :
(by extension) Of property: in a poor state due to abandonment or neglect; dilapidated, neglected.
(adj) :
(chiefly US) Negligent in performing a duty; careless.
(n) :
(countable, by extension, derogatory) A homeless or jobless person; a vagrant; also, a person who is (perceived as) negligent in their hygiene and personal affairs.
(n) :
(countable, chiefly US) A person who is negligent in performing a duty.
(adj) :
(specifically) Of a ship: abandoned at sea; of a spacecraft: abandoned in outer space.