The noise of Charley’s laughter, and the voice of Miss Betsy, who opportunely arrived to throw water over her friend, and perform other feminine offices for the promotion of her recovery, might have kept many people awake under more happy circumstances than those in which Oliver was placed.
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,