Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
evilness is a noun meaning "the quality of being morally wrong in principle or practice". It carries one recorded sense.
the quality of being morally wrong in principle or practice
“attempts to explain the origin of evil in the world”
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 evilness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.