overopinionated

adjective

over·​opin·​ion·​at·​ed ˌō-vər-ə-ˈpin-yə-ˌnā-təd 

: excessively opinionated

She's disgusted that her field … is being infiltrated by … overopinionated philistines …

—Jane Goldman

… a Web site one can visit to ask random questions … of an anonymous audience of overeducated and overopinionated geeks.

—Tom Vanderbilt

… the overopinionated … little book that put so many people in this unhappy state of grammatical angst.

—Geoffrey K. Pullum

Word History

First Known Use

1704, in the meaning defined above