Open English Wordnet
Adverbs
(r)unquestionably, unimpeachablywithout question“Fred Winter is unquestionably the jockey to follow”, “they hired unimpeachably first-rate faculty members”
(r)decidedly, unquestionably, emphatically, definitely, in spades, by all oddswithout question and beyond doubt“it was decidedly too expensive”, “she told him off in spades”, “by all odds they should win”