1 dumb, inarticulate, lost for words, mum, mute, silent, tongue-tied, unable to get a word out (informal) wordless
2 (figurative) aghast, amazed, astounded, dazed, dumbfounded, dumbstruck, shocked, thunderstruck
English Collins Dictionary - English synonyms & Thesaurus
If you are speechless, you are temporarily unable to speak, usually because something has shocked you. adj usu v-link ADJ, oft ADJ with n
Alex was almost speechless with rage and despair.
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