adj lost; adrift; hence, wanting; careless; neglectful; unfaithful.
2. derelict ·noun a tract of land left dry by the sea, and fit for cultivation or use.
3. derelict ·adj given up or forsaken by the natural owner or guardian; left and abandoned; as, derelict lands.
4. derelict ·noun a thing voluntary abandoned or willfully cast away by its proper owner, especially a ship abandoned at sea.