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

1.
sprakeloos, stom
unable to speak, especially as a result of shock or strong emotion
:
•
She was left completely speechless by the unexpected proposal.
Ze was volledig sprakeloos door het onverwachte voorstel.
•
He was speechless with rage.
Hij was sprakeloos van woede.