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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.

“This will for sure be a multi-billion dollar business for us.”

From Barron's • Apr. 24, 2026

We won’t know for sure until that drilled rock sample reaches labs on Earth.

From The Wall Street Journal • Apr. 23, 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

“Yeah, you won’t know for sure until it’s midnight and your foot is hanging off the bed. If something grabs it? Haunting. Easy to tell.”

From "Bye Forever, I Guess" by Jodi Meadows