Definition of: derelict

(der′ə·likt) adjective
1. Neglectful of obligation; unfaithful; remiss.
2. Deserted or abandoned.
—noun
1. That which is deserted or abandoned.
2. Any property which is abandoned at sea, as a deserted wreck.
3. Land exposed or gained by receding of the sea.
4. One who betrays a trust.
5. A person outside the pale of respectability. [<L derelictus, pp. of derelinquere <de- completely + relinquere abandon]