American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
He laughed loud and long Velasco stood imperturbable, his arms folded; he seemed to be dreaming, his mind far away.— The Black Cross
"It's not necessary Bristow, imperturbable, his motions quick and sure, tore up that page also, and started afresh Later she believed I had embezzled in order to assure her ease and luxury from the date of our marriage Her exaggerated sense of fair play, of obligation, was an aid to my representations of the situation Although she no longer loved me and did love Withers, my hold on her rather on her purse, could not be broken She gave me the money in Atlantic City and Washington.— The Winning Clue
Kwong used to listen, imperturbable, thinking his own thoughts.— Civilization Tales of the Orient
Her smooth brow puckered She turned troubled eyes to Kayak Bill, sitting silent, imperturbable, in a cloud of tobacco smoke, his interest apparently fixed where the slight breeze was ruffling the evening radiance of the water Still mutely questioning, Naleenah glanced at the figure of the young white man, slumped in stupor against the flag-pole A look of unutterable scorn distorted her face.— Where the Sun Swings North
She had grown so used to seeing him calm, imperturbable, smiling cheerfully no matter what she said or did, that his passionate outbreak amazed her.— North of Fifty-Three

Century Dictionary (1)
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You can expect to see this word about once a year.
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