Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unstirred is an adjective meaning "not agitated by stirring". It carries one recorded sense.
not agitated by stirring
“the ingredients sat in the bowl unstirred while she buttered the pan”
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 unstirred come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.