speechless
/ˈspiːt͡ʃ.lɪs/ adjective B2- Not speaking; not knowing what to say; silent, especially due to surprise, amazement, etc.; wordless. · When he walked into his surprise birthday party, he was completely speechless.
From the library
Miss Barry actually laughed--a sound which caused Diana, waiting in speechless anxiety in the kitchen outside, to give a great gasp of relief.
Anne went to bed that night speechless with misery because Matthew had said the wind was round northeast and he feared it would be a rainy day tomorrow.
For a moment Dantès was speechless; then he remembered that these caves might have been filled up by some accident, or even stopped up, for the sake of greater security, by Cardinal Spada.
So extreme was the surprise of the sailor, that he was unable even to thank Edmond, whose receding figure he continued to gaze after in speechless astonishment.
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