- imperturbable as an adjective:
Not easily perturbed or excited or upset; marked by extreme calm and composure:
— Hitherto imperturbable, he now showed signs of alarm.
— An imperturbable self-possession.
Roget 823: insensible, unconscious; impassive, impassible; blind to, deaf to, dead to; unsusceptible, insusceptible; unimpressionable†, unimpressible†; passionless, spiritless, heartless, ... show more
Moby thesaurus: balanced, bovine, collected, complacent, composed, cool, dispassionate, dull, even-tempered, fast, fiducial, firm, firm as Gibraltar, impassive, in equilibrium, inexcitable, inirritable, nonchalant, patient, predictable ... show more.
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