An opinion is someone's view of an issue. In common usage, the literal meaning is an expression of personal or professional views based on knowledge, emotion, or other factors. In practice an opinion may not be expressed, but used as the basis of a decision. The term may be qualified by adjectives in any context, positive or negative.
Examples of Opinion:
What's your opinion of this wine?|
I know you've got an opinion, but I don't expect you to tell me what it is.
He's a very highly opinionated person, sure. I just think he should know something about the subjects.
Is this a professional or personal opinion?