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"Before the recent removal of quarantine measures, many workers had expressed frustration over the city’s onerous travel restrictions, which at one point required up to 21 days of hotel quarantine." — Michelle Toh, CNN, 19 Oct. 2022

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Not to go too heavy on the etymology, but the story behind onerous is at once straightforward and, dare we say, poetic. But perhaps that’s putting the cart before the horse. Onerous rolled into the English language during the 14th century, via Middle French, from the Latin adjective onerosus, "burdensome." That word, in turn, was hitched to the noun onus, meaning "burden" (source too of our word onus, which usually refers to a burden or responsibility). Onus shares an ancient root with the Sanskrit word anas, meaning "cart." So although onerous stresses a sense of laboriousness and often figurative heaviness (especially because something is distasteful, e.g. "the onerous task of cleaning up the mess"), it has a deep connection with a literal weight borne by a person, horse, or other beast of burden.