8 letters · 9 points in Scrabble
verb make senseless or dizzy by or as if by a blow
verb hit something or somebody as if with a sandbag
verb overcome as with astonishment or disbelief
originFrom Middle English stunnyng, stonyng (also stoniynge, stonyynge), equivalent to stun + -ing.
Etymology from Wiktionary, CC BY-SA 3.0