unquestionably, unimpeachably -- (without question; "Fred Winter is unquestionably the jockey to follow"; "they hired unimpeachably first-rate faculty members")
decidedly, unquestionably, emphatically, definitely, in spades, by all odds -- (without question and beyond doubt; "it was decidedly too expensive"; "she told him off in spades"; "by all odds they should win")
(Sound)
