opine

Borrowed from Middle French opiner, from Latin opīnor (“to hold as an opinion”), from *opīnus (“thinking, expecting”), only in negative nec-opīnus (“not expecting”) and in-opīnus (“not expected”); akin to optō (“to choose, desire”), and to apīscor (“to obtain”); see optate and opt.

Derived from Ancient Greek ὀπός (opós, “juice of a plant”) + -ine.