imperturbably








adjective

  1. incapable of being upset or agitated; not easily excited; calm: imperturbable composure.

adjective

  1. not easily perturbed; calm; unruffled
adj.

c.1500, from Middle French imperturbable and directly from Late Latin imperturbabilis “that cannot be disturbed” (Augustine), from assimilated form of in- “not, opposite of” (see in- (1)) + *perturbabilis, from Latin perturbare “to confuse, disturb” (see perturb). Related: Imperturbably; imperturbability.

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