Opinionated :: Opinionated (a.) Stiff in opinion; firmly or unduly adhering to one's own opinion or to preconceived notions; obstinate in opinion.
Opinionative :: Opinionative (a.) Unduly attached to one's own opinions; opinionated.
Opinionative :: Opinionative (a.) Of the nature of an opinion; conjectured.
Opinionator :: Opinionator (n.) An opinionated person; one given to conjecture.