For the first seven miles Miss Bertram had very little real comfort: her prospect always ended in Mr. Crawford and her sister sitting side by side, full of conversation and merriment; and to see only his expressive profile as he turned with a smile to Julia, or to catch the laugh of the other, was a perpetual source of irritation, which her own sense of propriety could but just smooth over.
At a distance, unassailed by his looks or his kindness, and safe from the perpetual irritation of knowing his heart, and striving to avoid his confidence, she should be able to reason herself into a properer state; she should be able to think of him as in London, and arranging everything there, without wretchedness.
There are no more uses of "perpetual" in the book.
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A perpetual flame burns beside the grave of John F. Kennedy.