Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
downrightness is a noun meaning "the quality of being direct and straightforward". It carries one recorded sense.
the quality of being direct and straightforward
“what some people take for rudeness is really straightforwardness”
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 downrightness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.