untheatrical

/ʌnθiˈætrɪkəl/
adjective
  1. Not dramatic or exaggerated; natural and restrained in behavior or style.
    • His untheatrical acting made the scene feel very real.
    • She gave an untheatrical speech that was calm and sincere.
    • The director wanted an untheatrical approach, with simple lighting and no big gestures.
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