marvellously UK /ˈmɑːvələsli/US /ˈmɑɹvələsli/ adverb2 •In a marvellous manner.The plan worked marvellously, even better than we had expected. •To a great or impressive degree; very.I groaned with hunger. I had seen a marvellously large penny loaf at a baker's—the largest I could possibly get for the price. — 1899 formsmore marvellously · most marvellously