Definition of speechless adjective from the Oxford Advanced Learner's Dictionary

 

speechless

 adjective
adjective
BrE BrE//ˈspiːtʃləs//
 
; NAmE NAmE//ˈspiːtʃləs//
 
Surprise
 
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not able to speak, especially because you are extremely angry or surprised Laura was speechless with rage. His words left her speechless. See related entries: Surprise Word Origin Old English spǣclēas (see speech, -less).Extra examples Rachel stood speechless. The news left us all speechless. She came out of the office followed by a speechless Charles.
See the Oxford Advanced American Dictionary entry: speechless