definitely

adverb

def·​i·​nite·​ly ˈde-fə-nit-lē 

ˈdef-nət-

1

: in a definite way : in a way free of all ambiguity, uncertainty, or obscurity

I will definitely be there.

He's very smart and very funny and is definitely a practical actor. He comes to work to get his job done and to make the best movie possible …

—Anna Kendrick

Omaha is definitely not hip; green-haired XML programmers do not glide past gourmet coffee emporiums on Razor scooters.

—Adam Rogers

2

a

—used in speech as a forceful way of expressing agreement or saying "yes"

"Do you think they'll win?" "Definitely!"

b

—used in speech in the phrase definitely not as a forceful way of expressing disagreement or saying "no"

"Do you agree with him?" "Definitely not!"

Synonyms of definitely

• certainly
• surely
• sure
• clearly
• probably
• really

Examples of definitely in a Sentence

that is definitely the kind of dog we're looking to adopt

Recent Examples on the Web

So definitely grateful for every step of the journey, whether that was good or bad. —Ren Clayton, CBS News, 12 Dec. 2025

While Chalamet may or may not be working in the music industry, he's definitely got more work as an actor ahead. —Raechal Shewfelt, Entertainment Weekly, 12 Dec. 2025

That’s definitely important for America’s economy, too. —David Goldman, CNN Money, 12 Dec. 2025

Now is definitely my moment, especially since my style guru, Martha Stewart, recently wore a velour matching set. —Jamie Allison Sanders, PEOPLE, 12 Dec. 2025

Word History

Etymology

definite + -ly entry 2

First Known Use

1574, in the meaning defined at sense 1

Rhymes for definitely

• indefinitely

Video

How to Remember the Spelling of 'Definitely'

A definitive answer.