Full of flavor; having a strong, pleasant, or distinctive taste (British spelling).
From 'flavour' (British spelling of flavor) plus the suffix '-ful' (from Old English '-full'), meaning 'full of'. This is the British English variant spelling of 'flavorful'.
British and American English split on spelling around the 1800s, when American lexicographers like Noah Webster simplified spellings—so 'flavourful' is the older British way, while Americans use 'flavorful'!
Complete word intelligence in one call. Free tier — 50 lookups/day.