/ Dictionary / Index I imperturbable: Meaning and Definition of Find definitions for: im•per•turb•a•ble Pronunciation: (im"pur-tûr'bu-bul), [key] — adj. incapable of being upset or agitated; not easily excited; calm: imperturbable composure. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: imperturbable (Thesaurus) impertinent imperturbation Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language