After making one or two sallies to her relief, which were rendered futile by the umbrella’s hopping on again, like an immense bird, before I could reach it, I came in, went to bed, and slept till morning.
There are no more uses of "futile" in the book.
Show samples from other sources
It was a futile effort that was doomed form the start.
Negotiations between the opposing parties are increasingly looking futile.