mudo
= mute, dumb [dumber -comp., dumbest -sup.].
Ex: The young librarian was not accustomed to seeing the head of reference red-faced with mute anger or the head of technical services mumbling uncontrollably to himself.
Ex: This thesaurus contains a number of wretched, insensitive cross-references, like from dumb to DEAF, and from Feeble minded, Imbecility, and Morons to MENTALLY HANDICAPPED.
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* quedarse mudo = be speechless, be gobsmacked.