Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
shadowiness is a noun meaning "relative darkness caused by light rays being intercepted by an opaque body". It carries one recorded sense.
relative darkness caused by light rays being intercepted by an opaque body
“it is much cooler in the shade”
“there's too much shadiness to take good photographs”
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 shadowiness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.