’It is not for one, situated, through his original errors and a fortuitous combination of unpropitious events, as is the foundered Bark (if he may be allowed to assume so maritime a denomination), who now takes up the pen to address you — it is not, I repeat, for one so circumstanced, to adopt the language of compliment, or of congratulation.
There are no more uses of "fortuitous" in the book.
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profits were enhanced by a fortuitous drop in the cost of raw materials
The situation was resolved by the fortuitous appearance of the caddymaster,