'flavorful' originates from English, formed from the noun 'flavor' + the suffix '-ful' (Old English '-ful', meaning 'full of' or 'characterized by').

'flavor' entered Middle English as 'flavour' from Old French (e.g. 'flaveur'/'fleur' variants) and became the modern English 'flavor'/'flavour'; adding the suffix '-ful' produced 'flavorful' and its adverbial form 'flavorfully'.

Initially the root referred to taste or scent (the noun 'flavor'); over time compounds with '-ful' came to mean 'full of that quality' so 'flavorful' meant 'full of flavor' and 'flavorfully' 'in a manner full of flavor'.