Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
noisome is an adjective meaning "causing or able to cause nausea". It carries 2 recorded senses.
causing or able to cause nausea
“a nauseating smell”
“nauseous offal”
“a sickening stench”
offensively malodorous
“a foul odor”
“the kitchen smelled really funky”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for noisome come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.