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

Category 4 or higher is certainly within the realm of possibility. —Marshall Shepherd, Forbes, 25 Sep. 2024

Though there are certainly many other fellow A-list musicians represented at the museum — Harry Styles, Beyoncé and Lil Nas X, to name a few — Rihanna’s replica will be honored in the Fashion Runway Zone alongside figures of RuPaul, Zendaya and Kendall Jenner. —Hannah Dailey, Billboard, 25 Sep. 2024

An alfresco fireplace, swimming pool, and dining area are certainly perks. —Abby Montanez, Robb Report, 25 Sep. 2024

The launch of the new Meta Quest 3S virtual reality headset — on sale Oct. 15, starting at $299 — was certainly exciting. —Zev Fima, CNBC, 25 Sep. 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