For certain
For certain adverb - Definitely or positively (`sure' is sometimes used informally for `surely').
True and for certain are semantically related. in definite topic. In some cases you can use "True" instead an adjective phrase "For certain".
True
True adjective - Being exactly as appears or as claimed.
For certain and true are semantically related. Sometimes you can use "For certain" instead an adjective "True".
Mutual synonyms
Both terms in one sentence
- Thus we know for certain that the statement "All fish are aquatic creatures, but not all aquatic creatures are fish." is sound, valid, and true.
Source: Sound, Valid, True - According to side materials, most gods started off as humans, though the only one we know for certain this is true for is Kanako (and Suwako is closer to being a Genius Loci).
Source: Deity of Human Origin - Also, the villain is usually telling the truth, or something that is "technically" true, for certain values of "true", anyway—there are only a few cases where the villain just makes something up for giggles.
Source: Villains Never Lie
Cite this Source
True and For certain. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/for_certain/true
For certain & True. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/for_certain/true>.
True or For certain. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/for_certain/true.
Google Ngram Viewer shows how "for certain" and "true" have occurred on timeline