opinionate
o·pin·ion·ate
(ə-pĭn′yə-năt′)intr.v. o·pin·ion·at·ed, o·pin·ion·at·ing, o·pin·ion·ates
To express one's opinion, especially in an uninformed or stubborn manner.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.