He had felt a subtle, dark, and murmurous presence penetrate his being and fire him with a brief iniquitous lust: it, too, had slipped beyond his grasp leaving his mind lucid and indifferent.
It broke from him like a wail of despair from a hell of sufferers and died in a wail of furious entreaty, a cry for an iniquitous abandonment, a cry which was but the echo of an obscene scrawl which he had read on the oozing wall of a urinal.
There are no more uses of "iniquity" in the book.
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That was when I realized I had to climb up from the depths of iniquity.