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English to English adjective
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Incapable of being disturbed or disconcerted; as, imperturbable gravity. |  | source: webster1913
adjective satellite
| 2 |
not easily perturbed or excited or upset; marked by extreme calm and composure | | Example: hitherto imperturbable, he now showed signs of alarm
an imperturbable self-possession
unflappable in a crisis
source: wordnet30
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