Nonvalid and Sure

Opposite meaning words

Nonvalid adjective - Having no basis in reason or fact.

Usage example: a nonvalid theory that most scientists rejected long ago

Show all Definitions

Sure is an antonym for nonvalid.

Sure adjective - Having or showing a mind free from doubt.

Show all Definitions

Nonvalid is an antonym for sure.

Nearby Word: surely

Cite this Source

Sure and Nonvalid. (2017). Retrieved 2026, August 14, from https://thesaurus.plus/related/nonvalid/sure

Nonvalid & Sure. N.p., 2017. Web. 14 Aug. 2026. <https://thesaurus.plus/related/nonvalid/sure>.

Sure or Nonvalid. 2017. Accessed August 14, 2026. https://thesaurus.plus/related/nonvalid/sure.

Google Ngram Viewer shows how "nonvalid" and "sure" have occurred on timeline