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.