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We found one dictionary with English definitions that includes the word flabbergastingly: Click on the first link on a line below to go directly to a page where "flabbergastingly" is defined. General (1 matching dictionary) flabbergastingly: Merriam-Webster's Online Dictionary, 11th Edition [home, info] (Note: See flabbergast for more definitions.)

Quick definitions from WordNet (flabbergast) ▸ verb:  overcome with amazement ▸ Also see flabbergast