"It appears I come at an inopportune time, madam," said he, "when my friend, Mr. Rochester, is from home; but I arrive from a very long journey, and I think I may presume so far on old and intimate acquaintance as to instal myself here till he returns."
There are no more uses of "opportune" in the book.
Show samples from other sources
They launched their company at an opportune time.
During the rare, inopportune social moments when I found myself squeezed between black and white, I fled to the black side,