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

But keeping their promotion rivals at bay most definitely was, Parkinson’s men conceding 24 times in those dozen games, 16 of which came on Welsh soil. — Richard Sutcliffe, New York Times, 15 Aug. 2026

Blanco Gran Reserva Ask any collector about Spanish wines and the name Faustino will definitely come up in the conversation. — Mike Desimone, Robb Report, 14 Aug. 2026

Season two, the external pressures definitely go up because expectations have been set and a precedent exists. — Nicole Fell, HollywoodReporter, 14 Aug. 2026

Simplicity and craft are definitely what everyone thinks of when Instagram comes to mind. — Aurich Lawson, ArsTechnica, 13 Aug. 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.