ĭn-ŏpīnor

ātus sum, 1, v. dep.
I. to suppose, think, opine: Alexander facilius inopinatus, Val. Res Gest. Alex. M. 1, 52 Mai. (but a false read. for opinor, Gell. 18, 7, 5).
Lewis & Short
A Latin Dictionary, 1879
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