Fortuitous and Sure
Opposite meaning words
Fortuitous
Fortuitous adjective - Happening by chance.
Usage example: firmly believes that the creation of the universe was something other than just the fortuitous coming together of particles of matter
Sure is an antonym for fortuitous.
Sure
Sure adjective - Having or showing a mind free from doubt.
Fortuitous is an antonym for sure.
Nearby Word: surely
Cite this Source
Sure and Fortuitous. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/fortuitous/sure
Fortuitous & Sure. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/fortuitous/sure>.
Sure or Fortuitous. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/fortuitous/sure.
Google Ngram Viewer shows how "fortuitous" and "sure" have occurred on timeline