23
alien(noun, adjective, extraneous, not human)
12
celestial(adjective, excellent, sweet, wonderful, fantastic)
10
supernatural(adjective, excellent, sweet, wonderful, exceptional)
10
unearthly(adjective, fantastic, abstract, spiritual)
10
inhuman
9
unworldly(adjective, fantastic, spiritual)
9
foreign(adjective, outside, external, extraneous)
6
exotic(adjective, extraneous)
4
ethereal(adjective, fantastic, abstract, spiritual)
4
heavenly(adjective, excellent, sweet, wonderful, exceptional)
4
Martian(noun, adjective, alien, celestial)
4
strange(adjective, extraneous)
3
extrinsic(adjective, outside, external, extraneous)
3
divine(adjective, excellent, sweet, wonderful, fantastic)
3
paradisal(adjective, heavenly)
2
external(adjective, outside, extraneous)
2
eerie(adjective, extraneous, not human)
2
exterior(noun, adjective, outside, external)
2
extraneous(adjective, outside, external, extraneous)
2
outside(adjective, external, extraneous)
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APASmart Define. (2016). extraterrestrial thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/extraterrestrial/thesaurus/synonyms
ChicagoSmart Define. 2016. "extraterrestrial thesaurus" https://smartdefine.org/extraterrestrial/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, extraterrestrial thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/extraterrestrial/thesaurus/synonyms>.
MLASmart Define. "extraterrestrial thesaurus" 15 March 2016. Web. 20 September 2026. <https://smartdefine.org/extraterrestrial/thesaurus/synonyms>