n. 执拗, 顽固, 顽强, (疾病的)难治

[ noun ]
persistent determination
<noun.attribute>

Pertinacity \Per`ti*nac"i*ty\, n. [Cf. F. pertinacit['e].]
The quality or state of being pertinacious; obstinacy;
perseverance; persistency. --Macaulay.

Syn: See {Obstinacy}.