He was, as has been said, standing on Rocinante, with his arm passed through the hole and his wrist tied to the bolt of the door, and in mighty fear and dread of being left hanging by the arm if Rocinante were to stir one side or the other; so he did not dare to make the least movement, although from the patience and imperturbable disposition of Rocinante, he had good reason to expect that he would stand without budging for a whole century.
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.