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over·opin·ion·at·ed | \ ˌō-vər-ə-ˈpin-yə-ˌnā-təd 
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\Definition of overopinionated
: 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
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Time Traveler for overopinionated
The first known use of overopinionated was in 1704
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