stranger

(noun) anyone who does not belong in the environment in which they are found. Synonyms: alien, unknown.

(noun) an individual that one is not acquainted with.

(adj) being definitely out of the ordinary and unexpected; slightly odd or even a bit weird. Synonyms: strange (vs. familiar), unusual. Examples: "A strange exaltation that was indefinable." "A strange fantastical mind." "What a strange sense of humor she has."

(adj) not known before. Synonyms: strange, unknown. Examples: "Used many strange words." "Saw many strange faces in the crowd." "Don't let anyone unknown into the house."

(adj) relating to or originating in or characteristic of another place or part of the world. Synonyms: foreign (vs. native), strange. Examples: "Foreign nations." "A foreign accent." "On business in a foreign city."