opinative

Etymology
From, and its source, , from the participle stem of.

Adjective

 * 1) Conjectural; expressing an opinion rather than a fact.
 * 2)  Opinionated, maintaining one's position stubbornly.
 * , New York Review of Books, 2001, p.44:
 * [Socrates] was an illiterate idiot, to philosophers and travellers, an opinative ass, a caviller, a kind of pedant