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 offseason, one, and then spring training, definitely different. — Andrew Baggarly, New York Times, 4 Sep. 2026

But the late-night revelry definitely penetrated the walls of her hotel. — Jeanne Bonner, CNN Money, 3 Sep. 2026

The show definitely embraced this vision of an almost futuristic nirvana. — Brent Lang, IndieWire, 3 Sep. 2026

That said, longtime Gran Turismo fans will definitely be more excited for the other new track, which is actually an old one. — Adam Ismail, The Drive, 3 Sep. 2026

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.