Noisome is a formal and literary word used to describe things that are very unpleasant or disgusting; it is used especially to describe offensive smells. Noisome can also mean “highly obnoxious or objectionable” as in “we were put off by their noisome habits.”

// The noisome odor of a trash can in the alley was so strong that even diners seated inside the adjacent restaurant complained to staff.

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“During the fourteenth century, the bubonic plague outbreak that came to be known as the Black Death claimed thousands of victims, condemning them to a rapid and painful end. As the sufferers deteriorated, the disease tainted them with a tell-tale, repellent stench, which seemed to confirm smell as the root cause of the illness. ... Noisome dwellings were set right by fumigation, while rooms were doused with strong-smelling substances like vinegar and turpentine—anything to keep at bay the dreaded miasma.” — Ashley Ward, Where We Meet the World: The Story of the Senses, 2023

Noisome looks and sounds like a close relation of noisy, but it’s not. While noisy describes what is excessively loud, noisome typically describes what is excessively stinky. (It is also used to describe things offensive to the senses generally, as well as things that are highly obnoxious, objectionable, or simply harmful.) Noisome comes from the synonymous Middle English noysome, which combines the suffix -some, meaning “characterized by a specified thing,” and the noun noy, meaning “annoyance.” Noisy, incidentally, comes ultimately from Latin nausea, meaning “nausea.”