The grey block of Trinity on his left, set heavily in the city’s ignorance like a dull stone set in a cumbrous ring, pulled his mind downward and while he was striving this way and that to free his feet from the fetters of the reformed conscience he came upon the droll statue of the national poet of Ireland.
There are no more uses of "droll" in the book.
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I appreciate her droll sense of humor.
I can usually count on a droll tweet a week from her.