For certain
For certain adverb - Definitely or positively (`sure' is sometimes used informally for `surely').
Really and for certain are semantically related. in definitely topic. In some cases you can use "Really" instead an adverb phrase "For certain".
Really
Really adverb - In actual fact.
For certain and really are semantically related. Sometimes you can use "For certain" instead an adverb "Really".
Mutual synonyms
Related pairs
Both terms in one sentence
- By the end of the book, nobody knows for certain whether he's really dead, or just (As the uptimers call it) 'pulling an Elvis'.
Source: Literature / 1632 - A large problem is due to how this is a story of a really messed up family in-fighting and the fact that we don't know for certain who is related to who.
Source: Manhwa / Cavalier of the Abyss - Unfortunately, GearScore really took off, and some raid readers began enforcing "Minimum GearScore" requirements for certain content.
Source: Unstable Equilibrium
Cite this Source
Really and For certain. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/for_certain/really
For certain & Really. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/for_certain/really>.
Really or For certain. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/for_certain/really.
Google Ngram Viewer shows how "for certain" and "really" have occurred on timeline