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1. Offensive to the point of arousing disgust; foul: a noisome odor.
2. Harmful or dangerous: noisome fumes.

[Middle English noiesom : noie, harm (short for anoi, annoyance, from Old French, from anoier, to annoy; see annoy) + -som, adj. suff.; see -some1.]

noi′some·ly adv.
noi′some·ness n.
Usage Note: People sometimes assume that noisome means "noisy," because the two words sound similar. But in our 2011 survey, 89% of the Usage Panel found the sentence We could barely hear each other with the noisome helicopter overhead to be unacceptable. If you use noisome as a synonym for noisy, there's a good chance that others will misinterpret your words and think you're describing someone or something as being offensive or harmful.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.noisomeness - the quality of being noxious
unwholesomeness, morbidness, morbidity - the quality of being unhealthful and generally bad for you
References in periodicals archive ?
The eloquent man was so sure of his ground and auditors--seemed so confident in his strength--so little like a doubting giant--that it was long before Beauchampe could discover that he was a mere wind-bag, a bloated vessel of impure air that, becoming fixed air through a natural process, at length explodes and breaks forth with a violence duly proportioned to its noisomeness.