8 letters · 9 points in Scrabble
adjective filled with the emotional impact of overwhelming surprise or shock
originApparently from astony, astonie, from Old French estonner, from Vulgar Latin *extonare. Compare English astonish, of which this was claimed in olden sources to be the more "correct" (or at least Biblical) version of the word.
Etymology from Wiktionary, CC BY-SA 3.0