alien (EN)
noun, adjective

noun “alien”

sg. alien, pl. aliens
  1. a person who comes from a different country and is now living in a new one
    Many aliens seek refuge in new countries to escape difficult conditions in their homeland.
  2. a creature that comes from somewhere outside of Earth
    The spaceship landed, and out stepped an alien with green skin and large, black eyes.

adjective “alien”

alien, non-gradable
  1. extremely different or not related to what is normal or expected
    The customs of the distant tribe were completely alien to the tourists.
  2. similar to or characteristic of beings from outer space
    The skull they found in the forest seemed alien.