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Synonyms

certainly

American  
[sur-tn-lee] / ˈsɜr tn li /

adverb

  1. with certainty; without doubt; assuredly.

    I'll certainly be there.

  2. yes, of course.

    Certainly, take the keys.

  3. to be sure; surely.

    He certainly is successful.
certainly British  
/ ˈsɜːtənlɪ /

adverb

  1. with certainty; without doubt

    he certainly rides very well
"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

  1. by all means; definitely: used in answer to questions

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of certainly

First recorded in 1250–1300; Middle English; certain + -ly

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.

If Rolls-Royce is about delivering world-apart experiences to its clients, the Spectre certainly represents.

From The Wall Street Journal • Apr. 4, 2026

Yet they have to correct for a yearslong decline in employer response rates to BLS surveys—which does not negate the data overall, but certainly makes preliminary calculations a bit more unsteady and speculative.

From Slate • Apr. 3, 2026

“I think there’s certainly a place to retain those allocations, but to just be an index investor internationally is difficult right now,” he says.

From Barron's • Apr. 3, 2026

Seizing Kharg Island and the islands near the mainland would require an amphibious landing on a contested shoreline, among “the hardest operations” a military can attempt, and one that Iran is almost certainly prepared for.

From Salon • Apr. 3, 2026

That was certainly more important than anything Mr. Grayson had planned right now.

From "A Boy Called Bat" by Elana K. Arnold

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.