Alien
Alien noun - Anyone who does not belong in the environment in which they are found.
Unknown is a synonym for alien in behaviour topic. In some cases you can use "Unknown" instead the word "Alien" as a noun or an adjective, when it comes to topics like strange, unfamiliar, foreign, from another country. popular alternative
Unknown
Unknown noun - Anyone who does not belong in the environment in which they are found.
Alien is a synonym for unknown in behaviour topic. You can use "Alien" instead the word "Unknown" as a noun or an adjective, if it concerns topics such as obscure, strange, from another country, foreigner. popular alternative
Nearby Words: unknowable, unknowing
Mutual synonyms
Both words in one sentence
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The ETI and the Exsurgent virus, whose agendas are completely unknown and alien to us humans, but so far seem quite evil.
Source: Tabletop Game / Eclipse Phase -
If the unknown dish turns out to be homo sapiens, then it's I'm a Humanitarian instead, except for cases when man is a regular ingredient in the alien cuisine.
Source: Alien Lunch - One of the first stories in Gintama has the daughter of an alien diplomat trying to rescue her unknown massive alien being.
Source: Hands Off My Fluffy!
Cite this Source
Unknown and Alien. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/alien/unknown
Alien & Unknown. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/alien/unknown>.
Unknown or Alien. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/alien/unknown.
Google Ngram Viewer shows how "alien" and "unknown" have occurred on timeline