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

The ladies really do it up, particularly Tamra and Vicki, who definitely hired a makeup artist to make them into the female version of Bad Grandpa. — Brian Moylan, Vulture, 17 July 2026

DeMarco said there’s no timetable for Satou Sabally (concussion), but a return definitely won’t be prior to All-Star Break. — Fiifi Frimpong, New York Daily News, 17 July 2026

Snipes will definitely set them up for success in the classroom this year. — Jaden Thompson, Footwear News, 17 July 2026

After all, when even offering a donut is filled with not just cream, but compelling complications, the play is definitely doing something right. — David John Chávez, Mercury News, 17 July 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.