alien

Universal Words adjective, noun adjective 1 ~ (to sb/sth) strange and frightening; different from what you are used to: an alien environment * In a world that had suddenly become alien and dangerous, he was her only security. 2 (often disapproving) from another country or society; foreign: an alien culture * alien influences that threatened their way of life 3 ~ to sb/sth (disapproving) not usual or acceptable: The idea is alien to our religion. * A referendum is alien to the party's concept of democracy. * Cruelty was quite alien to him. 4 connected with creatures from another world: alien beings from outer space noun 1 (AmE also non-citizen) (law or technical) a person who is not a citizen of the country in which they live or work: an illegal alien 2 a creature from another world: aliens from outer space