harebrained

Imagine someone trying to build a rocket in their backyard out of cardboard boxes and duct tape: that's a harebrained scheme. The word "harebrained" describes plans, ideas, or people that are very foolish, impulsive, and unlikely to work out well. It suggests poor judgment and a tendency to act without thinking. Think of a hare, a relative of the rabbit, darting around in a quick, wild way; that image helps explain the name. You might use the word for a friend's sudden decision to quit their job and travel the world with no money.

"Harebrained" isn't just about being silly; it implies a specific kind of silliness—one that is reckless, impractical, and born from impulsive thinking. The origin of the term dates back to the 16th century, referring to the "mad" behavior of hares, particularly during their spring mating season (which also gave us the phrase "mad as a March hare"). While some people mistakenly spell it as "hair-brained"—thinking it describes a head filled with hair instead of brains—the word truly belongs to the animal kingdom.

While often used to describe plans or schemes ("a harebrained attempt to rob a bank"), it can also be applied directly to people. A "harebrained fellow" is someone prone to acting without thinking things through. It's stronger than simply calling something "foolish"; it suggests a level of wildness and a total disregard for consequences.

You're less likely to hear it used in formal settings, but it thrives in storytelling and casual conversation when describing outlandish or ill-conceived ideas. For example: "Old Man Hemlock had a harebrained idea to train squirrels to deliver his mail." Or, "Her harebrained decision to dye her hair green right before the job interview didn't exactly impress the hiring manager."

So, if something sounds like it was dreamed up in a moment of wild abandon and is almost guaranteed to fail spectacularly, chances are it's wonderfully, hilariously… harebrained.