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Dictionary.com
Definitions

for sure

ADVERB
definitely
Synonyms
WEAK
certainly dead sure definitely for a fact for certain for real no doubt no question no two ways about it really surely unquestionably

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.

Though we can’t say for sure what his tenure will bring, there seems to be consensus: putting the focus back on the devices.

From The Wall Street Journal • Apr. 22, 2026

The truth of “SNL” is that there’s no way to really know for sure if it will play with an audience until the sketch gets in front of one.

From Salon • Apr. 19, 2026

There are theories that it could be related to autoimmunity, or repeated trauma to that area, or genetic mutations—but no one knows for sure.

From Slate • Apr. 18, 2026

All I can tell you for sure Friday is what one baseball official texted me when I asked for reaction to the Padres’ sale: “Great news for the Angels.”

From Los Angeles Times • Apr. 17, 2026

The only thing I know for sure is that I’m done trying to be someone I’m not.

From "Red Flags and Butterflies" by Sheryl Azzam