flabbergaster noun 2verb 1forms 3 noun2 •A person, thing, fact or event that is flabbergasting, or that causes extreme shock.Nothing on earth so delights the Mexican heart as a real flabbergaster of a funeral. — 1917 •A state of surprise or fear. verb1 •(no longer used) To perplex or amaze; to shock or frightenBut I've got an invention in my 'ead — at all events, the notion of an invention, that I ventures to say will work wonders in the terrestrial globe — flabbergaster the world! — 1888 formsflabbergastered · flabbergastering · flabbergasters