Source : Webster's Revised Unabridged Dictionary (1913)

Bewitching \Be*witch"ing\, a.
   Having power to bewitch or fascinate; enchanting;
   captivating; charming. -- {Be*witch"ing*ly}, adv. --
   Be*witch"ing*ness, n.

Source : WordNet®

bewitchingly
     adv : in a bewitching manner; "she was bewitchingly beautiful"
           [syn: {captivatingly}, {enchantingly}, {enthrallingly}]