Synonyms of alien in English:

alien


See US English definition of alien

See UK English definition of alien

See Spanish definition of extranjero

adjective

1‘the study of alien cultures promotes self-awareness’

SYNONYMS
foreign, overseas, non-native, external, distant, remote
ANTONYMS

native

2‘emerging from the station in the City, they found themselves in an alien landscape’

SYNONYMS
unfamiliar, unknown, unheard of, foreign
strange, peculiar, odd, bizarre, outlandish
remote, exotic, novel
ANTONYMS

familiar

3‘he has been asked to adopt a vicious role alien to his nature’

SYNONYMS
incompatible with, unusual for, opposed to, conflicting with, contrary to, adverse to, in conflict with, at variance with, antagonistic to
unacceptable to, repugnant to, hostile to, inimical to
rare oppugnant to
ANTONYMS

familiar

4‘alien beings have landed on Earth’

SYNONYMS
extraterrestrial, other-worldly, unearthly
Martian, Venutian, Jovian
ANTONYMS

earthly


noun

1‘he was deported as an illegal alien’

SYNONYMS
foreigner, foreign national, non-native, immigrant, emigrant, émigré, incomer, newcomer, visitor, outsider, stranger
ANTONYMS

native

2‘the alien's spaceship has crashed’

SYNONYMS
extraterrestrial, ET
Martian, Venutian, Jovian
informal little green man