speechless
US /ˈspiːtʃ.ləs/
UK /ˈspiːtʃ.ləs/

1.
sem palavras, mudo
unable to speak, especially as a result of shock or strong emotion
:
•
She was left completely speechless by the unexpected proposal.
Ela ficou completamente sem palavras com a proposta inesperada.
•
He was speechless with rage.
Ele estava sem palavras de raiva.