Uncertain
Uncertain adjective - Likely to change frequently, suddenly, or unexpectedly.
Vague is a synonym for uncertain in property topic. In some cases you can use "Vague" instead an adjective "Uncertain", when it comes to topics like certain, unclear, doubtful, unsure. popular alternative
Nearby Words: uncertainty, uncertainly
Vague
Vague adjective - Not expressed in precise terms.
Usage example: gave as vague a reply as he could, hoping not to give away the surprise
Uncertain is a synonym for vague in unclear topic. You can use "Uncertain" instead an adjective "Vague", if it concerns topics such as property, certain, ambiguous, not definite or clear. popular alternative
Mutual synonyms
Related pairs
Both words in one sentence
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Says he feels all alone in a threatening world where what lies ahead is vague and uncertain.
Source: Actually, I Am Him - The exact degree of their distinctive height and features is vague, leaving it uncertain whether they'd strike us as beautiful, or as borderline Humanoid Abominations.
Source: Literature / Book of the New Sun - Of course, this could also be referred to as the Vague Age where it's uncertain what particular human age their ages are supposed to correspond to.
Cite this Source
Vague and Uncertain. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/uncertain/vague
Uncertain & Vague. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/uncertain/vague>.
Vague or Uncertain. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/uncertain/vague.
Google Ngram Viewer shows how "uncertain" and "vague" have occurred on timeline