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

 

impassive

 adjective
adjective
BrE BrE//ɪmˈpæsɪv//
 
; NAmE 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.Extra examples Her expression was cool, almost impassive. His usually impassive expression was creased with worry. It was impossible to tell what he was thinking behind his impassive face.
See the Oxford Advanced American Dictionary entry: impassive