OPINIONATIVE

opinionated, opinionative, self-opinionated

(adjective) obstinate in your opinions

Source: WordNet® 3.1

Adjective

opinionative (comparative more opinionative, superlative most opinionative)

Of, pertaining to, being, or expressing opinion.

(of persons) Opinionated.

Source: Wiktionary

O*pin"ion*a*tive, a.

1. Unduly attached to one's own opinions; opinionated. Milton.

2. Of the nature of an opinion; conjectured. [Obs.] "Things both opinionative and practical." Bunyan.

– O*pin"ion*a*tive*ly, adv.

– O*pin"ion*a*tive*ness, n.

Source: Webster’s Unabridged Dictionary 1913 Edition