Dictionary.com
Thesaurus.com
Showing results for for certain. Search instead for Avoid certain food.
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

What she knew for certain was that increased fuel costs were making her life much harder.

From Barron's • May 2, 2026

The firm has been grappling with slower demand for certain advisory services and lower-than-expected levels of voluntary attrition following overhiring during the pandemic.

From The Wall Street Journal • Apr. 29, 2026

“All we know for certain is that the treasure is hidden in a cavernous room underneath this school.”

From "The Smartest Kid in the Universe" by Chris Grabenstein

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.