Certain
Certain adjective - Known but not named.
Vague
Vague adjective - Not seen or understood clearly.
Usage example: I have only a vague idea of what you're talking about
Both words in one sentence
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These can only be opened by possessing certain titles, skills, or items, or by performing certain very specific actions based on rather vague clues.
Source: Video Game / Mabinogi - Similarly, the manual also contains a walkthrough of about half the game, probably circumventing the sloppy translation that otherwise makes certain early goals too vague.
Source: Guide Dang It / Final Fantasy -
Vague Age: Ben's age is deliberately kept vague, with the only certain thing being that he was born in the 80s.
Source: Web Video / Oddity Archive
Cite this Source
Vague and Certain. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/certain/vague
Certain & Vague. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/certain/vague>.
Vague or Certain. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/certain/vague.
Google Ngram Viewer shows how "certain" and "vague" have occurred on timeline