opinative
/ˈɒpɪnətɪv/adjective
Of the nature of, or expressing, an opinion; founded on opinion; conjectural, uncertain.
Origin
Late Middle English. From Middle French opinatif, opinative relating to opinion, presumptuous and its etymon post-classical Latin opinativus expressing a conjecture from classical Latin opīnāt-, past participial stem of opīnārī + -īvus. Compare Italian opinativo.