Englishopine
verb
the headmistress opined that the outing would make a nice change:
suggest, submit, advance, propose, venture, volunteer, put forward, moot, propound, posit, air, hazard, say, declare, observe, comment, remark;
think, believe, consider, maintain, imagine, be of the view, be of the opinion, reckon, guess, estimate, conjecture, fancy, suspect, feel, have a/the feeling, assume, presume, take it, suppose, expect, gather;
contend, be convinced, be of the conviction, reason, deduce, conclude, theorize, hypothesize, take as a hypothesis;
North American, informal allow;
archaic ween.