unexpressive

/ˌʌnɪkˈsprɛsɪv/
adjective
  1. Not showing feelings, thoughts, or emotions; lacking expression.
    • She tried to stay unexpressive when she heard the surprising news, not wanting to react.
    • His face remained unexpressive during the entire speech, giving no clue to his opinion.
    • The actor's unexpressive performance made the audience feel disconnected from the story.
Antonyms
What does "unexpressive" mean? | whatsthatwordmean | whatsthatwordmean