Certainly vs Definitely

When to use each in English, with meaning, register, and examples.

	Certainly	Definitely
Meaning	Definitely; for sure.	For sure, without a doubt
CEFR level	A2	A2
Part of speech	adverb	adverb
Usage notes	Use 'certainly' when you want to emphasize affirmation or agreement. It is more formal than 'sure' and works well in professional settings, but might feel too strong in casual conversations.	Use 'definitely' to emphasize certainty. It fits well in both spoken and written English. Avoid using it in overly formal contexts where alternatives like 'certainly' might be more suitable.

Frequently asked questions: Certainly vs Definitely

What's the difference between "Certainly" and "Definitely"?

"Certainly" means: Definitely; for sure. "Definitely" means: For sure, without a doubt

When should I use "Certainly" and "Definitely"?

They can all be used in everyday English.

Are "Certainly" and "Definitely" the same CEFR level?

"Certainly" is at A2, "Definitely" is at A2 on the CEFR scale.