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Synonyms

for certain

Idioms  

  1. Also, for sure. Without doubt. For example, I can't tell for certain if this is the right color, or I know for sure that she has a new car. The first term dates from the early 1300s. The variant, dating from the late 1500s, is also used colloquially to express agreement or assert the truth of a statement, as in Mary is really bossy.—That's for sure, or Are you coming to the party?—For sure I am.

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.

The law also contains problematic exemptions for certain categories of plastic foodware, they say.

From Los Angeles Times • May 7, 2026

A new clinical trial suggests that giving immunotherapy before surgery may dramatically improve outcomes for certain colorectal cancer patients.

From Science Daily • May 6, 2026

The insurer is also removing the step for certain services that are nearly always approved, and for some that other insurers didn’t require.

From The Wall Street Journal • May 5, 2026

It’s also possible that punishments for certain players could be harsher than what Koepka received.

From MarketWatch • Apr. 30, 2026

I know for certain he just went to Florida one time.

From "The Wrong Way Home" by Kate O’Shaughnessy

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.