Im′per‐turb″a‐ble (?), a. [L. imperturbabilis; pref. im- not + perturbare to disturb: cf. F. imperturbable. See Perture.] Incapable of being disturbed or disconcerted; as, imperturbable gravity.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.