castaway

Short definition from Wiktionary

Adjective

1. 1
   Cast adrift or ashore; marooned.
2. 2
   Shipwrecked.
3. 3
   Cast out; rejected or excluded from a group.

Noun

1. 1
   A shipwrecked sailor.
2. 2
   A discarded person or thing.
3. 3
   An outcast; someone cast out of a group or society.