Definition of speechlessly adverb from the Oxford Advanced Learner's Dictionary

 

speechlessly

 adverb
adverb
BrE BrE//ˈspiːtʃləsli//
 
; NAmE NAmE//ˈspiːtʃləsli//
 
 
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without being able to speak, especially because you are extremely angry or surprised She stared at him speechlessly.