A fool's errand

Origin

The word "errand" hails from the Old English "ærende," meaning a "message" or "mission." By the 16th century, when this phrase began to solidify in the English lexicon, a "fool" was not merely someone lacking intelligence, but often a jester or a simpleton, easily tricked or prone to making ill-advised decisions. The combination of a "fool" and an "errand" conjured the vivid image of a useless, perhaps even ridiculous, task—like sending someone to fetch a bucket of steam or a left-handed smoke shifter. It painted a picture of utterly futile effort, a mission destined to yield nothing, thus cementing its place as a common idiom for any pointless undertaking.