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

• 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

The Mandalorian and Andor are done (Mando with its movie), The Acolyte was cancelled, The Book of Boba Fett is definitely dead. —Paul Tassi, Forbes.com, 1 July 2025

Paris is definitely the strongest fashion week, with a very good balance between mega brands that delivered great shows and emerging talents or independent brands with high creative voices. —Rhonda Richford, Footwear News, 30 June 2025

Miley Cyrus knows how to strike a pose and her pal supermodel Naomi Campbell definitely knows the ins and outs of looking glamorous. —Gil Kaufman, Billboard, 30 June 2025

He's known for being an elite three-point shooter, which is something Detroit could definitely use more of in order to compete at the highest level in the conference. —Evan Massey, MSNBC Newsweek, 30 June 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.