belonging to a foreign country

an alien culture

unfamiliar and disturbing or distasteful

principles that are alien to them

they found the world of further education a little alien

supposedly from another world; extraterrestrial

alien beings

an alien spacecraft

a foreigner, especially one who is not a naturalized citizen of the country where he or she is living

an enemy alien

a hypothetical or fictional being from another world

she discovers that the alien's spaceship has crashed