Altered
Unknown
Unknown adjective - Happening or existing without one's knowledge.
Altered and unknown are semantically related. Sometimes you can use "Altered" instead an adjective "Unknown".
Nearby Words: unknowable, unknowing
Mutual synonyms
Both words in one sentence
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When The Lion King was re-released for IMAX theaters, several scenes were altered and/or reanimated for unknown reasons.
Source: Digital Destruction -
It's unknown at this point if it's a side-effect of the time cracks thing that makes her able to remember parts of altered timelines.
Source: Converse with the Unconscious - The cure is found to be olive oil...subverted, because it much later turns out that someone developed the cure, and then altered the olive oil to carry it, unknown to anyone at the time.
Source: Improbable Antidote
Cite this Source
Unknown and Altered. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/altered/unknown
Altered & Unknown. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/altered/unknown>.
Unknown or Altered. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/altered/unknown.
Google Ngram Viewer shows how "altered" and "unknown" have occurred on timeline