say it: DUHM-struhk
dumbstruck is an adjective meaning "as if struck dumb with astonishment and surprise". It carries one recorded sense.
as if struck dumb with astonishment and surprise
“a circle of policemen stood dumbfounded by her denial of having seen the accident”
“the flabbergasted aldermen were speechless”
“was thunderstruck by the news of his promotion”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for dumbstruck come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.