Opinionated

[Sarah]

Stiff in opinion; firmly or unduly adhering to one's ownopinion or to preconceived notions; obstinate in opinion. Sir W.Scott.

[Sarah]

Someone who isn't afraid to give their personal opinion. It doesn't have to be a bad thing. It's just someone that doesn't stay quiet, if they don't agree with something.

The only people who see it as bad and attach stigma (like the other definitions) to it are those that don't like to hear opinionated people talk.

Yes, you can be opinionated and polite at the same time. Being polite doesn't mean you have to agree with every objectionable thing that's said.

[Sarah]

Unreasonably holding to one's own opinion. Oftin can be stubborn towards one's own opinion as well.

Can also be used in a noun: opinionatedness
Can also be used as an adverb: opinionatedly

[Sarah]

Having and voicing an opinion is different from being opinionated. Opinionated rightly has negative connotations because it means doggedly holding on to your opinions without considering circumstances and/or facts and/or advice/views of others.

[Sarah]

An often irritating personality trait by which a stubborn, strong willed person always has to give their strong opinions, sometimes to the point of always believing they have to be right and have the last word.

[Sarah]

A strong willed person who knows what he/she is talking about.

[Sommer]

An opinionated person is certain about their beliefs, and expresses their ideas strongly and often:

[Sonia]

Conceitedly assertive and dogmatic in ones opinions.