a. 坚持不放的, 执拗的, 顽固的, 顽强的, (疾病)难以治好的

[ adj ]
stubbornly unyielding
<adj.all>
dogged persistencedour 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

Pertinacious \Per`ti*na"cious\, a. [L. pertinax, -acis; per +
tenax tenacious. See {Per-}, and {Tenacious}.]
1. Holding or adhering to any opinion, purpose, or design,
with obstinacy; perversely persistent; obstinate; as,
pertinacious plotters; a pertinacious beggar.

2. Resolute; persevering; constant; steady.

Diligence is a steady, constant, and pertinacious
study. --South.

Syn: Obstinate; stubborn; inflexible; unyielding; resolute;
determined; firm; constant; steady.
※ -- {Per`ti*na"cious*ly}, adv. --
{Per`ti*na"cious*ness}, n.