By all means, assuredly, admittedly, absolutely, and affirmative are all synonyms for certainly. No and possibly are these antonyms of certainly. And here are another 50 synonyms for certainly.
Certainly Synonyms
1. assuredly
- Assuredly
- Beyond doubt
- Beyond question
- Clearly
- Conclusively
- Definitely
- Evidently
- Incontestably
- Incontrovertibly
- Indisputably
- Indubitably
- Irrefutably
- Manifestly
- Obviously
- Palpably
- Patently
- Plainly
- Surely
- There are no two ways about it
- Transparently
- Undeniably
- Undisputedly
- Undoubtedly
- Unequivocally
- Unmistakably
- Unquestionably
- Without question
- As sure as eggs is eggs
2. admittedly
- Admittedly
- Beyond question
- Definitely
- Undoubtedly
- Without question
- Without a doubt
3. absolutely
- Absolutely
- Affirmative
- By all means
- Definitely
- Indeed
- Naturally
- Of course
- Positively
- Quite
- Sure
- Unquestionably
- Without doubt
- Without question
- Yes
- Rather