From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
dumb /dˈʌm/
dumm, dämlich [Dt.] [Schw.] , dusselig [Dt.] [Schw.] , dusslig [Norddt.] , doof [Norddt.] [Mitteldt.] , blöde [Norddt.] [Mitteldt.] , deppert [Bayr.] [Ös.] [ugs.] , töricht [geh.] , beknackt <adj> [Dt.] [ugs.]
Note: Person
"be (as) dumb as a rock" - strohdumm sein
Synonyms: silly, stupid, foolish, dopey, doltish, air-headed, gormless, dull
see: sillier, more stupid, more foolish, dumber, more dopey, doltisher, more gormless, duller, silliest, most stupid, most foolish, dumbest, most dopey, doltishest, most gormless, dullest, as thick as they come, thick as a plank, thick as two (short) planks, be (as) thick as two short planks, play dumb, act dumb, Silly me! I've locked myself out of the car.
From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
dumb /dˈʌm/
sprachlos <adj>
Note: vor
"be struck dumb" - sprachlos sein
Synonyms: speechless, dumbstruck
From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
dumb /dˈʌm/
stumm, sprechunfähig <adj>