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

Also, if the sesame balls with red bean paste pastries are available, then definitely try them for a post-noodle sweet treat. —Shindy Chen, Charlotte Observer, 5 Sep. 2025

It’s named after—and home to—arguably one of the most iconic mountains in the country, and definitely the most iconic in Georgia. —Essence, 5 Sep. 2025

And people definitely took advantage of it. —Morgan Korn, ABC News, 5 Sep. 2025

Seattle might not be a Super Bowl contender, but ranking the Seahawks 20th — three spots behind the last-place Arizona Cardinals, mind you — definitely feels pretty disrespectful. —Matthew Schmidt, MSNBC Newsweek, 4 Sep. 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.