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

1.
senza parole, muto
unable to speak, especially as a result of shock or strong emotion
:
•
She was left completely speechless by the unexpected proposal.
Rimase completamente senza parole per la proposta inaspettata.
•
He was speechless with rage.
Era senza parole dalla rabbia.