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Definition of certainly : Without doubt or question; unquestionably.

Synonyms:

for certain, literally, really, yes, sure enough, actually, easily, simply, inarguably, limited, all right, sure as shooting, forsooth, hands down, certain, I don't see why not, for sure, doubtless, evidently, by all means, sure, help yourself, essentially, alright, unarguably, so, if you (really) must, if you want, as you wish, precisely, of course

assertively, affirmatively, declaratively

flatly, denominationally, undeniably, typically

categorically, unequivocally, definitely, unqualifiedly, utterly, absolutely, completely, supremely, unconditionally, unrestrictedly, positively, indubitably, surely, conclusively, consummately, perfectly

incontestably, clearly, irrefutably, indisputably, plainly, obviously, unquestionably, steadfastly, doubtlessly, incontrovertibly, trustingly, veritably, assuredly, irrefragably, undoubtedly

factually, axiomatically, honestly, rightly, truly, authentically

faithfully, dependably, loyally, reliably, trustworthily, conscientiously

Usage examples:

• " No, no; certainly not. - "Only One Love, or Who Was the Heir", Charles Garvice.
• " I certainly don't understand," I said. - "Blindfolded", Earle Ashley Walcott.
• " Well," Roger said, " it certainly is big enough." - "The Boy With the U. S. Survey", Francis Rolt-Wheeler.