…myself, and sometimes ready to die of weakness, my mind was filled with the massacre of my father, mother, and brother, with the insolence of the ugly Bulgarian soldier, with the stab that he gave me, with my servitude under the Bulgarian captain, with my hideous Don Issachar, with my abominable Inquisitor, with the execution of Doctor Pangloss, with the grand Miserere to which they whipped you, and especially with the kiss I gave you behind the screen the day that I had last seen you.
There are no more uses of "hideous" in the book.
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The beast had hideous fangs.
He had a hideous scar running from his forehead to his jaw.