be certain of

VERB

believe

Synonyms

STRONGEST

accept admit conclude consider have hold regard suppose think trust understand

STRONG

accredit affirm buy conceive credit deem posit postulate presuppose swallow

WEAK

attach weight to be convinced of be credulous be of the opinion count on fall for give credence to have faith in have no doubt keep the faith lap up place confidence in presume true reckon on rest assured swear by take as gospel take at one's word take for granted take it

Antonyms

STRONGEST

abandon deny disbelieve discard dismiss dispute disregard exclude forget ignore neglect refuse reject

WEAK

distrust

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

be certain of

Of course, borrowers can’t be certain of how banks will react to the new proposal until it’s finalized and companies have time to digest it.

From Barron's ● Jun. 29, 2026

Although he fought back to seventh, which brought him two points, he needed to finish fifth to be certain of the championship.

From BBC ● Dec. 1, 2025

As to what the courts do, I would like to think they would block it, but again, I can’t be certain of that.

From Slate ● Mar. 29, 2025

City needs to win its final game of the season to be certain of winning the title ahead of second-place Arsenal.

From Seattle Times ● May 19, 2024

A flash of what he could have sworn was pain shone in her eyes, but it was gone before he could be certain of it.

From "Throne of Glass" by Sarah J. Maas

be certain of

Example Sentences

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