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

For families While the Serbelloni is a family-friendly hotel—the indoor kids pool, watersports, and babysitting help—its ambience definitely lends itself better to older guests. — Condé Nast, Condé Nast Traveler, 7 Oct. 2026

As Madison explains, picking her first post-Oscar gig definitely stressed her out, but her desire to grow her career and range (a la Cate Blanchett and Isabelle Huppert) helped push her to take on the project. — Kate Erbland, IndieWire, 6 Oct. 2026

The Mississippi State grad, 61, has definitely done his share of watching, waiting and warning us about countless, serious weather events. — Madeleine Marr, Miami Herald, 6 Oct. 2026

Social media has definitely magnified the ability for different cultures and cuisines to be shared across the world. — Lauren Schuster, Fort Worth Star-Telegram, 6 Oct. 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.