say it: dis-AHY-duhd-lee
decidedly is an adverb meaning "without question and beyond doubt". It carries one recorded sense.
without question and beyond doubt
“it was decidedly too expensive”
“she told him off in spades”
“by all odds they should win”
Definitions, synonyms and semantic relations for decidedly come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.