speechless
adjective uk/ˈspiːtʃ.ləs/ us/ˈspiːtʃ.ləs/
C1 （因气愤、震惊、惊讶等）说不出话的，无语的，哑口无言的
unable to speak because you are so angry, shocked, surprised, etc.
The news left us speechless. 那个消息让我们哑口无言。
She was speechless with indignation. 她气得说不出话来。
Synonyms: dumb dumbfounded