Synonyms of 'of course'
▷ See course
naturallyDictionary, certainly, obviouslyThere'll be the usual inquiry, of course.
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You use certainly to emphasize what you are saying when you are making a statement.
I'll certainly do all I can to help.
You use definitely to emphasize that something is the case, or to emphasize the strength of your intention or opinion.
Something should definitely be done about him.
Thesaurus for of course from the Collins English Thesaurus
You say of course to suggest that something is normal , obvious , or well-known , and should therefore not surprise the person you are talking to.