Here's an interesting bit from today's Garner's Usage Tip of the Day:
Noisome is often misconstrued as meaning "noisy; loud; clamorous." In fact, it means "noxious; malodorous." The word is related etymologically to "annoy."
Here's the etymology for noisome from the American Heritage Dictionary: "From the Middle English noiesom : noie, meaning harm (short for anoi, meaning annoyance, from Old French, from anoier, meaning to annoy)" + "the Middle English -som, from the Old English -sum, meaning -like."
And the AHD etymology for annoy: "From the Middle English anoien, from the Old French anoier, ennuyer, from the Vulgar Latin inodiāre, meaning to make odious."
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