Where does “opinatively” come from?

opinatively (English) comes from English opinative, from Middle French opinatif, from Latin opinativus, from Latin opīnārī.

opinatively (English): In an opinative manner

Definitions

Step	Language	Word	Meaning
1	English	opinative	Conjectural; expressing an opinion rather than a...
2	Middle French	opinatif	—
3	Latin	opinativus	—
4	Latin	opīnārī	—

opinatively — Etymology, Origin & Word History | Etymology Explorer