In a manner full of feasts or celebration; abundantly and with festive cheer in an archaic or literary sense.
From 'feastful' (full of feasts) plus the adverb suffix '-ly.' The base combines 'feast' with '-ful,' creating a rare archaic adverb form.
This is a double-stacked suffix word—'feast' + '-ful' + '-ly'—making it extremely archaic, probably appearing only in Victorian poetry to describe scenes of lavish, abundant celebration!
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