pertinacious

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The Word of the Day for April 13 is:

pertinacious   \per-tuh-NAY-shuss\   adjective
   *1 a : adhering resolutely to an opinion or purpose b : 
perversely persistent
     2 : stubbornly unyielding or tenacious

Example sentence:
     The professor spent much of the class hour in debate with a 
pertinacious student about gun control.

Did you know?
     If you say "pertinacious" out loud, it might sound 
familiar. That may be because if you take away the word's first 
syllable, you're left with something very similar to the 
word "tenacious," which means "tending to adhere or cling." The 
similarity between "pertinacious" and "tenacious" isn't mere 
coincidence; both words ultimately derive from "tenax," the 
Latin word for "tenacious," and ultimately from the 
verb "tenere," meaning "to hold." But "pertinacious" 
and "tenacious" aren't completely interchangeable. Both can 
mean "persistent," but "pertinacious" suggests an annoying or 
irksome persistence, while the less critical "tenacious" implies 
strength in maintaining or adhering to something valued or 
habitual.

*Indicates the sense illustrated in the example sentence.