Certain and Undefined

Opposite meaning words

sentence examples

Certain

Certain adjective - Known but not named.
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Synonyms for Certain
Antonyms for Certain
Undefined is an antonym for certain.
Nearby Words: certainty, certainly

Undefined

Undefined adjective - Not seen or understood clearly.
Usage example: plagued by undefined worries that kept her awake at night
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Synonyms for Undefined
Antonyms for Undefined
Certain is an antonym for undefined.
Similar words of certain

Similar words of undefined

Both words in one sentence

  • Video Game / Touhou Flying Saucer: Part of the system in Undefined Fantastic Object involves collecting small UFOs from certain enemies that carry them.
    Source: Video Game / Touhou
Cite this Source
Undefined and Certain. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/certain/undefined
Certain & Undefined. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/certain/undefined>.
Undefined or Certain. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/certain/undefined.

Antonyms for certain


Antonyms for undefined

Google Ngram Viewer shows how "certain" and "undefined" have occurred on timeline