Definition of impassive adjective from the Oxford Advanced American Dictionary

 

impassive

 adjective
adjective
NAmE//ɪmˈpæsɪv//
 
 
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not showing any feeling or emotion synonym emotionless her impassive expression/face The two men remained impassive throughout the trial.
impassively
 
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adverb The accused listened impassively as the judge sentenced him.
See the Oxford Advanced Learner's Dictionary entry: impassive