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The Collaborative International Dictionary
Opiniated

Opiniated \O*pin"ia*ted\, a. Opinionated. [Obs.]

Douglas Harper's Etymology Dictionary
opiniated

"obstinately attached to one's opinion," 1590s, past participle adjective from opiniate (from Latin opinio), a verb where now we use opine. Also see opinion.

Wiktionary
opiniated

a. (obsolete form of opinionated English)