stranger, alien, unknown -- (anyone who does not belong in the environment in which they are found)
stranger -- (an individual that one is not acquainted with)
Overview of adj strange
The adj strange has 3 senses
strange, unusual -- (being definitely out of the ordinary and unexpected; slightly odd or even a bit weird; "a strange exaltation that was indefinable"; "a strange fantastical mind"; "what a strange sense of humor she has")
strange, unknown -- (not known before; "used many strange words"; "saw many strange faces in the crowd"; "don't let anyone unknown into the house")
foreign, strange -- (relating to or originating in or characteristic of another place or part of the world; "foreign nations"; "a foreign accent"; "on business in a foreign city")
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