He felt that he ought not to have allowed the marriage; that his daughter’s sentiments had been sufficiently known to him to render him culpable in authorising it; that in so doing he had sacrificed the right to the expedient, and been governed by motives of selfishness and worldly wisdom.
There are no more uses of "culpable" in the book.
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He is culpable of copyright infringement.
Congress was as culpable as the President for the gridlock.