Strange, unfamiliar, unknown, foreign, extraterrestrial, creature from outer space, space invader or Martian.
synonym I had this for class.
Sometimes, depending on what, it could be 'different.'
Alien Grays Little Green Men Martians
* alien * expatriate * nonnative * offshore * overseas
newcomer, outlander, foreigner, outsider, alien
different, unusual, new, untried, strange, alien
alien, exotic, unknown, strange, imported, remote, unfamiliar
Synonyms: exterior, alien, foreign Antonyms: Inside, internal.
That would be ALIAS; Alien Lifeform Intended for Assassination and Sabotage.
Strange, foreign, alien, outside, and extrinsic are all synonyms for extrinsic.
One synonym for the word "foreign" is "international." This term is often used to describe things that are from or relate to other countries.
Native is a word. A synonym would be another word that means the same thing, such as aborigine or perhaps inhabitant. An antonym would be a word meaning the opposite, such as alien or immigrant.