Definition of speechless adjective from the Oxford Advanced American Dictionary

 

speechless

 adjective
adjective
NAmE//ˈspitʃləs//
 
 
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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.
speechlessly
 
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adverb She stared at him speechlessly.
speechlessness
 
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noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: speechless