certainly

Used to say that you are sure something is true or will happen.

• It is certainly cold today.
• You will certainly need a coat.
• That was certainly the best meal we had.

Similar words: definitely, surely, undoubtedly

Common phrases: certainly true, will certainly help, certainly not

A polite way to say yes or agree to do something.

• “Can I sit here?” “Certainly.”
• “Could you help me?” “Certainly, give me a moment.”
• “May we leave early?” “Certainly, you have finished your work.”

Similar words: of course, yes

Opposites: no

Common phrases: certainly you may, certainly sir, certainly why not

In a way that shows firm knowledge or leaves no doubt.

• We cannot know certainly what happened.
• The cause could not be established certainly.
• Can anyone determine certainly which account is accurate?

Similar words: with certainty, conclusively

Opposites: uncertainly

Common phrases: know certainly, establish certainly, determine certainly