certainly

adverb

cer·​tain·​ly ˈsər-tᵊn-lē 

1

: in a manner that is certain : with certainty

2

: it is certain that : assuredly

Synonyms

• all right
• alright
• assuredly
• clearly
• definitely
• doubtless
• easily
• forsooth
• hands down
• inarguably
• incontestably
• incontrovertibly
• indeed
• indisputably
• plainly
• really
• so
• sure
• surely
• truly
• unarguably
• undeniably
• undoubtedly
• unquestionably

Examples of certainly in a Sentence

It will certainly rain tomorrow.

This year's festival was certainly much better than last year's.

I'm certainly going to try.

The new version is most certainly easier to use.

The snake that bit her was almost certainly poisonous.

Recent Examples on the Web

The country’s tally is now up to 11 since 2022, but that’s almost certainly a significant undercount considering the lack of routine testing. —Yasmin Tayag, The Atlantic, 23 July 2024

The eye-popping size of the Afreximbank fund could certainly be a game-changer for the continent. —Christopher Vourlias, Variety, 23 July 2024

But centrism is certainly worth pursuing passionately and unreservedly. —Jennifer Rubin, Washington Post, 23 July 2024

That halo effect will certainly be in store for Deadpool & Wolverine; the other unknown factor in terms of overperformance is how many parents bring their kids. —Nancy Tartaglione, Deadline, 23 July 2024

Word History

First Known Use

14th century, in the meaning defined at sense 1

Phrases Containing certainly

• certainly not

Kids Definition

certainly

adverb

cer·​tain·​ly ˈsərt-ᵊn-lē 

1

: in a manner that is certain : for certain

the only event of which anything is certainly known

2

: without doubt : surely

certainly you can do it