Not sure
Not certain and not sure are semantically related. In some cases you can use "Not certain" instead an adverb phrase "Not sure".
Not certain
Not sure and not certain are semantically related. You can use "Not sure" instead an adverb phrase "Not certain".
Mutual synonyms
Related pairs
- questionable and not sure
- questionable and not certain
- doubtful and not sure
- doubtful and not certain
- partially and not sure
- partially and not certain
- weakly and not sure
- weakly and not certain
- uncertain and not sure
- uncertain and not certain
- indefinite and not sure
- indefinite and not certain
- incompletely and not sure
- incompletely and not certain
Cite this Source
Not certain and Not sure. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/not_sure/not_certain
Not sure & Not certain. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/not_sure/not_certain>.
Not certain or Not sure. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/not_sure/not_certain.
Google Ngram Viewer shows how "not sure" and "not certain" have occurred on timeline