Origin: Latin suffix -ous
Pertinacious has 2 different meanings across 1 category:
stubbornly unyielding
"dogged persistence"
"dour determination"
"the most vocal and pertinacious of all the critics"
"a mind not gifted to discover truth but tenacious to hold it"
"men tenacious of opinion"
Holding tenaciously to an opinion or purpose.