inexpressive

/ˌɪnɪkˈsprɛsɪv/
adjective
  1. Not showing feelings or thoughts; lacking expression.
    • She gave an inexpressive shrug, as if she didn't care about the news.
    • The actor's inexpressive performance made the audience feel disconnected.
    • His face remained inexpressive during the entire speech, giving no clue to his emotions.
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