positiveness n. + Add to list UK //pˈɒzɪtˌɪvnəs// pos·i·tive·ness SynonymsAntonymsEtymology Synonyms advantageousnessfavorablenessfavourablenessincontrovertibilityincontrovertiblenesspositivismpositivityprofitableness Antonyms negativenessnegativityunfavorablenessOrigin From positive + -ness.