dumbfound (also dumfound)

v [Tn esp passive 尤用於被动语态] make (sb) speechless with surprise; astonish 使（某人）受惊而说不出话; 使（某人）惊讶: We were completely dumbfounded by her rudeness. 她粗鲁无礼, 把我们吓呆了.

duff, duffer, duffle (also duffel), duffle bag, duffle-coat, dug, dug-out, duke, dukedom, dulcet, dulcimer, dull, dullard, dullness, dully, duly, dumb, dumb show, dumb waiter, dumb-bell, dumbly, dumbness, dumdum, dummy, dummy run, dump, dumper, dumpiness, dumping, dumpling, dumps, dumpy, dun, dunce, dunce's cap, dunderhead, dune, dung, dungarees, dungeon,