Main entry: stranger, unknown, alien
Definition: anyone who does not belong in the environment in which they are found
Antonyms: acquaintance, friend
Definition: a person with whom you are acquainted
Main entry: unknown
Definition: not known
Usage: an unknown amount; an unknown island; an unknown writer; an unknown source
Antonyms: known
Definition: apprehended with certainty
Main entry: unidentified, unknown, unnamed, nameless
Definition: being or having an unknown or unnamed source
Usage: a poem by an unknown author; corporations responsible to nameless owners; an unnamed donor
Antonyms: onymous
Definition: bearing a name
Main entry: unknown, strange
Definition: not known before
Usage: used many strange words; saw many strange faces in the crowd; don't let anyone unknown into the house
Antonyms: familiar
Definition: well known or easily recognized
Main entry: unsung, unknown, obscure
Definition: not famous or acclaimed
Usage: an obscure family; unsung heroes of the war
Antonyms: glorious
Definition: having or deserving or conferring glory
Main entry: unknown
Definition: not known to exist
Usage: things obscurely felt surged up from unknown depths
Antonyms: suspected
Definition: believed likely