Unknown
Unknown adjective - Happening or existing without one's knowledge.
Withheld and unknown are semantically related. In some cases you can use "Withheld" instead an adjective "Unknown".
Nearby Words: unknowable, unknowing
Withheld
Both words in one sentence
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Even in more modern eras, this is used when the real name of an individual is unknown or deliberately withheld.
Cite this Source
Withheld and Unknown. (2016). Retrieved 2026, August 12, from https://thesaurus.plus/related/unknown/withheld
Unknown & Withheld. N.p., 2016. Web. 12 Aug. 2026. <https://thesaurus.plus/related/unknown/withheld>.
Withheld or Unknown. 2016. Accessed August 12, 2026. https://thesaurus.plus/related/unknown/withheld.
Google Ngram Viewer shows how "unknown" and "withheld" have occurred on timeline