Modifies a noun

• pertinax: For this reason, it is called pertinacious, pertinax, because it works away all the time at the same thing.

• manner: She would offer them to people with her politely pertinacious manner and upper-middle-class accent and invariably had good sales.

Modifying Another Word

• politely: She would offer them to people with her politely pertinacious manner and upper-middle-class accent and invariably had good sales.

Used with adjective complement

• call: For this reason, it is called pertinacious, pertinax, because it works away all the time at the same thing.