derelict

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Deserted by an owner or keeper; abandoned.
2. adj. Run-down; dilapidated.
3. adj. Neglectful of duty or obligation; remiss. See Synonyms at negligent.
4. n. Abandoned property, especially a ship abandoned at sea.
5. n. A homeless or jobless person; a vagrant.
6. n. Law Land left dry by a permanent recession of the water line.

Century Dictionary and Cyclopedia

1. Left; abandoned by the owner or guardian.
2. Unfaithful; neglectful of requirement or responsibility: as, derelict in duty.
3. n. That which is abandoned; in law, an article of goods or any commodity thrown away, relinquished, or abandoned by the owner; specifically, a vessel abandoned at sea.
4. n. Land left dry by a change of the water-line.

Wiktionary

1. adj. Abandoned, forsaken; (of ship) abandoned at sea; dilapidated, neglected.
2. adj. Negligent in performing a duty.
3. n. Property abandoned by its former owner, especially a ship abandoned at sea.
4. n. dated An abandoned or forsaken person; an outcast.
5. n. A homeless and/or jobless person; a person who is (perceived as) negligent in their personal affairs and hygiene. (This sense is a modern development of the preceding sense.)

GNU Webster's 1913

1. adj. Given up or forsaken by the natural owner or guardian; left and abandoned.
2. adj. Lost; adrift; hence, wanting; careless; neglectful; unfaithful.
3. n. A thing voluntary abandoned or willfully cast away by its proper owner, especially a ship abandoned at sea.
4. n. A tract of land left dry by the sea, and fit for cultivation or use.

WordNet 3.0

1. n. a ship abandoned on the high seas
2. adj. worn and broken down by hard use
3. adj. failing in what duty requires
4. n. a person without a home, job, or property
5. adj. in deplorable condition
6. adj. forsaken by owner or inhabitants