11 letters · 19 points in Scrabble
verb overcome with amazement
originThe origin of the verb is uncertain; possibly dialectal (Suffolk), from flabby or flap (“to strike”) + aghast. The word may be related to Scottish flabrigast (“to boast”) or flabrigastit (“worn out with exertion”). The noun is derived from the verb.
Etymology from Wiktionary, CC BY-SA 3.0