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

This one definitely fits the bill, thanks to a subtly oversized, long-sleeve Henley T-shirt and straight-leg pants with a bold print and comfy elastic waistband. —Jamie Allison Sanders, PEOPLE, 26 Dec. 2025

It’s definitely made to hold your attention. —Hunter Ingram, Variety, 26 Dec. 2025

Celine Dion definitely got the Christmas assignment. —Gil Kaufman, Billboard, 26 Dec. 2025

But, while these muffins are definitely heavy on the vanilla flavor, our editors would certainly enjoy eating these for breakfast or having them as a mid-afternoon snack in the office. —Melinda Salchert, Southern Living, 26 Dec. 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.