The theatre or the rooms, where he was most likely to be, were not fashionable enough for the Elliots, whose evening amusements were solely in the elegant stupidity of private parties, in which they were getting more and more engaged; and Anne, wearied of such a state of stagnation, sick of knowing nothing, and fancying herself stronger because her strength was not tried, was quite impatient for the concert evening.
There are no more uses of "stagnate" in the book.
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We don’t want the economy to stagnate.
Their political victory led to stagnation and relative decline compared to surrounding countries.