Tubbs came in now and then, found him busy, patted his shoulder, said something which sounded like French and might even have been French, and gave vague encouragement; while Gottlieb imperturbably told him to go ahead, and now and then stirred him by showing his own note-books (they were full of figures and abbreviations, stupid-seeming as invoices of calico) or by speaking of his own work, in a vocabulary as heathenish as Tibetan magic: "Arrhenius and Madsen have made a contributionů
There are no more uses of "imperturbable" in the book.
Show samples from other sources
Silas was imperturbable.
Neil Gaiman -- The Graveyard Book
Out of loudspeakers all around Zollverein, the staccato voice of the Reich grows like some imperturbable tree; its subjects lean toward its branches as if toward the lips of God.