He was not in the least in a state of tension or of vigilance with regard to Catherine’s prospects he was even on his guard against the ridicule that might attach itself to the spectacle of a house thrown into agitation by its daughter and heiress receiving attentions unprecedented in its annals.
There are no more uses of "unprecedented" in the book.
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Human impact on the environment is increasing at an unprecedented rate.
The targeting of civilians is unprecedented in the conflict.