Sleeper
Sleeper noun - One who sleeps.
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Synonyms for Sleeper
Unknown and sleeper are semantically related. in remote possibility topic. In some cases you can use "Unknown" instead a noun "Sleeper".
Unknown
Unknown noun - An unknown and unexplored region.
Sleeper and unknown are semantically related. Sometimes you can use "Sleeper" instead a noun "Unknown".
Nearby Words: unknowable, unknowing
Mutual synonyms
Both words in one sentence
- The wife turned out, unknown even to herself, to be an alien sleeper agent sent to prepare for a planetary invasion.
- In Sleeper, TAO's motives are completely unknown to the characters, and the readers are led to believe he's running an incredibly complex Gambit Roulette to try to Take Over the World.
Source: Motive Misidentification -
ManTech is set in the future, though we don't know how far; the heroes' Sleeper Ship from Earth was discovered after having been adrift for an unknown length of time.
Source: The Future
Cite this Source
Unknown and Sleeper. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/sleeper/unknown
Sleeper & Unknown. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/sleeper/unknown>.
Unknown or Sleeper. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/sleeper/unknown.
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