unable to speak
temporarily silent; refusing to speak
that was a pretty dumb thing to do
"so dense he never understands anything I say to him"
"never met anyone quite so dim"
"although dull at classical learning, at mathematics he was uncommonly quick"
"dumb officials make some really dumb decisions"
"he was either normally stupid or being deliberately obtuse"
"worked with the slow students"
"speechless with shock"
Its thunder made the cataracts dumb.
The streets are dumb with snow.
Having to translate his work into dumbed-down metaphors for the shiny-shoe set.
出自： P. Bronson