Certain and Unstable

Certain

Certain adjective - Having been established and usually not subject to change.
Usage example: a certain percentage of the profits will go to charity

Unstable is an antonym for certain.

Nearby Words: certainty, certainly

Unstable

Unstable adjective - Likely to change frequently, suddenly, or unexpectedly.
Usage example: financial investors don't like an unstable economy

Certain is an antonym for unstable in doubtful topic.

Nearby Word: unstably

Both words in one sentence

  • Unstable Equilibrium: A player who gets far enough ahead is almost certain to win the game.
  • Self-Duplication Unfortunately, after a certain number of copies they get a little unstable and less like herself.
  • Loads and Loads of Loading In some cases, an unstable internet connection will cause certain browsers to think they're still loading when the connection is already broken.
Cite this Source
Unstable and Certain. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/certain/unstable
Certain & Unstable. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/certain/unstable>.
Unstable or Certain. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/certain/unstable.
Google Ngram Viewer shows how "certain" and "unstable" have occurred on timeline