His plan to travel across Spain might be another of his hare-brained ideas, and he was tormented by doubt.

No more of your hare-brained ideas.

I never took any notice of the hare-brained ideas churned out by lecturers and inspectors.

Anyway, I just thought I'd let you know your hare-brained idea turned out to be right, after all.

In the process, many half-baked if not hare-brained ideas acquired a permanence that has proved embarrassing.

Sonya rematerialized on the transmat platform and immediately asked, "Fabian, you have any more hare-brained ideas?"

What a hare-brained idea!

Because unlike the multitude of hare-brained, half-baked, poorly-thought-out ideas that swarmed yesteryear like stray cats on a dumpster full of albacore, this particular idea absolutely cannot fail!

The two female characters are close friends, habitually scheming together, Ethel being generally the voice of reason as a counterpart to Lucy's hare-brained ideas.

It's only if the emergency stretches out and they get time to form their own hare-brained ideas that you have to watch out for them.