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

Cain pointed out that having the president of the United States greasing the wheels definitely helped speed things along. — Alejandro Avila Outkick, FOXNews.com, 3 July 2026

It’s also led by arguably (but definitely, in my opinion) the best player to ever play the sport, Lionel Messi. — Ben Church, CNN Money, 3 July 2026

Keeping shrubs trimmed will definitely help to cut back on the mosquito population, especially the shrubs closest to your seating areas like the patio. — The Spruce, 2 July 2026

Throwing a multi-day wedding celebration at Madison Square Garden definitely isn’t cheap, but for Taylor Swift and Travis Kelce, cost is no obstacle. — Allison Degrushe, StyleCaster, 2 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.