imperturbable in Russian
imperturbable in Russian
невозмутимый
Not capable of being, or not easily, perturbed, excited, or upset; calm and collected, even under pressure.
непоколеби́мый
Not capable of being, or not easily, perturbed, excited, or upset; calm and collected, even under pressure.
непроница́емый
Not capable of being, or not easily, perturbed, excited, or upset; calm and collected, even under pressure.