Similar Words to Alien:

Alienate
Disaffect
Estrange
Exotic
Extraterrestrial
Extraterrestrial Being
Foreign
Foreigner
Noncitizen
Outlander
Stranger
Unknown

Examples:

1. I have a human half and an alien half at war with each other.
2. Never before has an alien sat beside our king in judgement.
3. You mean are they alien illusions?
4. No an alien smart enough to pull this could also keep my medical scanner from going "bleep!" I don't follow you.
5. India is an alien country to me.

Definitions of Alien:

1. A person who comes from a foreign country; someone who does not owe allegiance to your country
2. Anyone who does not belong in the environment in which they are found
3. A form of life assumed to exist outside the Earth or its atmosphere
4. Transfer property or ownership
5. Arouse hostility or indifference in where there had formerly been love, affection, or friendliness
6. Not contained in or deriving from the essential nature of something
7. Being or from or characteristic of another place or part of the world