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

 

expressionless

 adjective
adjective
BrE BrE//ɪkˈspreʃənləs//
 
; NAmE NAmE//ɪkˈspreʃənləs//
 
 
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not showing feelings, thoughts, etc. an expressionless face/tone/voice compare expressiveExtra examples His expressionless gaze followed her every move. His face remained expressionless. She noticed the boy watching her with grey, expressionless eyes.
See the Oxford Advanced American Dictionary entry: expressionless