Finally some sagacious persons opined that the article was nothing but an impudent satirical burlesque.
"Hallucinations are quite likely in your condition," the doctor opined, "though it would be better to verify them …. you must take steps at once, without a moment’s delay, or things will go badly with you."
There are no more uses of "opine" in the book.
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It’s ridiculous to opine that...
"Krakauer is a kook if he doesn’t think Chris ’Alexander Su-pertramp’ McCandless was a kook," opined a man from North Pole, Alaska.