Synonyms of alien

1. foreigner, alien, noncitizen, outlander, traveler, traveller: usage: a person who comes from a foreign country; someone who does not owe allegiance to your country
2. stranger, alien, unknown, intruder, interloper, trespasser: usage: anyone who does not belong in the environment in which they are found
3. extraterrestrial being, extraterrestrial, alien, hypothetical creature: usage: a form of life assumed to exist outside the Earth or its atmosphere

1. alien, alienate, transfer: usage: transfer property or ownership; "The will aliened the property to the heirs"
2. estrange, alienate, alien, disaffect, change, alter, modify: usage: arouse hostility or indifference in where there had formerly been love, affection, or friendliness; "She alienated her friends when she became fanatically religious"

1. alien, foreign, extrinsic (vs. intrinsic): usage: not contained in or deriving from the essential nature of something; "an economic theory alien to the spirit of capitalism"; "the mysticism so foreign to the French mind and temper"; "jealousy is foreign to her nature"
2. alien, exotic, foreign (vs. native), strange: usage: being or from or characteristic of another place or part of the world; "alien customs"; "exotic plants in a greenhouse"; "exotic cuisine"