OPINE
think, opine, suppose, imagine, reckon, guess
(verb) expect, believe, or suppose; “I imagine she earned a lot of money with her new novel”; “I thought to find her in a bad state”; “he didn’t think to find her in the kitchen”; “I guess she is angry at me for standing her up”
opine, speak up, speak out, animadvert, sound off
(verb) express one’s opinion openly and without fear or hesitation; “John spoke up at the meeting”
Source: WordNet® 3.1
Etymology 1
Verb
opine (third-person singular simple present opines, present participle opining, simple past and past participle opined)
(intransitive) To have or express an opinion; to state as an opinion; to suppose, consider (that).
(intransitive) To give one's formal opinion (on or upon something).
Etymology 2
Noun
opine (plural opines)
(biochemistry) Any of a class of organic compounds, derived from amino acids, found in some plant tumours
Source: Wiktionary
O*pine", v. t. & i. [imp. & p. p. Opined; p. pr. & vb. n. Opining.]
Etym: [L. opinari, p.p. opinatus; akin to opinus (in comp.) thinking,
and perh. to E. apt: cf. F. opiner.]
Definition: To have an opinion; to judge; to think; to suppose. South.
Source: Webster’s Unabridged Dictionary 1913 Edition