Plausible and Unknowable

Opposite meaning words

Plausible adjective - Worthy of being accepted as true or reasonable.

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Unknowable is an antonym for plausible.

Nearby Words: plausibly, plausibility

Unknowable adjective - Not knowable.

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Plausible is an antonym for unknowable in topics: belief, mind-boggling.

Nearby Words: unknown, unknowing

Merlin gives a plausible answer, but the Sphinx is looking for a specific one (that is virtually unknowable, relating to a then-obscure aspect of the story's world).

Source: Only Smart People May Pass

Cite this Source

Unknowable and Plausible. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/plausible/unknowable

Plausible & Unknowable. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/plausible/unknowable>.

Unknowable or Plausible. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/plausible/unknowable.

Google Ngram Viewer shows how "plausible" and "unknowable" have occurred on timeline