Definition of opiniativeness in English:
opiniativeness
Pronunciation /əˈpɪn(ɪ)ətɪvnɪs/ /əˈpɪnɪətɪvnɪs/
noun
rare Obstinate adherence to one's own opinion; opinionatedness.
Origin
Early 17th century; earliest use found in Randle Cotgrave (fl. 1587–?1630), lexicographer. From opiniative + -ness.