
Latin, meaning: persistent, firm, mean, stubborn, obstinate
Found on
http://archives.nd.edu/ppp.htm

Pertinax (Publius Helvius Pertinax Augustus; 1 August 126 – 28 March 193) was Roman Emperor for three months in 193. He is known as the first emperor of the tumultuous Year of the Five Emperors. A high-ranking military and Senatorial figure, he tried to restore discipline in the Praetorian Guards, whereupon they rebelled and killed him. Upon his...
Found on
http://en.wikipedia.org/wiki/Pertinax

persistent, firm, mean, stubborn, obstinate
Found on
https://www.math.ubc.ca/~cass/frivs/latin/latin-dict-full.html
No exact match found.