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

• 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

With so much passion behind the project, Rado’s Press is definitely off to a great start. —Clea Haran, Parents, 7 Aug. 2025

And if not, then that is definitely a worthwhile question (and perhaps a future column). —Miriam Kirmayer, SELF, 6 Aug. 2025

How to Blunt Blood Sugar Spikes from Watermelon Watermelon can definitely be included as part of a healthy, diabetes-friendly diet, said Coogan. —Caitlin Pagán, Verywell Health, 6 Aug. 2025

Well, to start, there are at least 26 fashion labels that should definitely be on your radar. —Alexandra Schöb, Glamour, 6 Aug. 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.