certainly

UK: /ˈsɜː^rt^ənli/ US: /ˈsɝtənli/ ,(sûr′tn lē)

WordReference Random House Learner's Dictionary of American English © 2025

cer•tain•ly /ˈsɜrtənli/   adv. 

1. surely;
   without doubt;
   undoubtedly:
   You certainly have done a fine job.
2. (used to show strong feeling or enthusiasm about something, to show agreement with what has been said, or to answer "yes'' to a question):
   This is certainly a fine party, isn't it? Can I have my pen back, please? —Certainly, sir.
See -cert-.

WordReference Random House Unabridged Dictionary of American English © 2025

cer•tain•ly  (sûr′tn lē), adv. 

1. with certainty;
   without doubt;
   assuredly:
   I'll certainly be there.
2. yes, of course:
   Certainly, take the keys.
3. surely;
   to be sure:
   He certainly is successful.

• 1250–1300; Middle English; see certain, -ly

Collins Concise English Dictionary © HarperCollins Publishers::

certainly / ˈsɜːt^ənlɪ/ adverb

1. with certainty; without doubt: he certainly rides very well

sentence_substitute

1. by all means; definitely: used in answer to questions