Opine – to give an opinion, sometimes unasked.
The word “opine” appears in Enjella Uprooted: A Tooth Fairy Gets A New Job on page 8:
“We don’t pay you to OPINE on teeth, we pay you to sort them.”
If I were to opine on the subject, I’d say there is very little chance you would actually use this word in a sentence on a daily basis. However, if you have firm opinions on subjects that are close to your heart, you might just find use for it occasionally.
Let me know how you use it!