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imperturbable adjective

  /ˌɪmpəɹˈtɜɹbəb(ə)l/ , /ˌɪmpəˈtɜːbəbl̩/
  • Not capable of being, or not easily, perturbed, excited, or upset; calm and collected, even under pressure.
 невозмутимый, непоколеби́мый, непроница́емый

imperturbably

невозмутимо

imperturbability noun

  • A state of calm, unruffled self-assurance; aplomb, composure.
 невозмути́мость
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