形容詞 pertinacious:

1. stubbornly unyielding
   同義詞：dogged, dour, tenacious, unyielding

1. She is the most vocal and pertinacious of all the critics of the policy.
   在所有的政策批評(píng)家中，她是陳詞最多而且最為固執(zhí)的。
2. His style of argument in meetings is not so much aggressive as pertinacious.
   他在會(huì)議上的辯論態(tài)度并非鋒芒逼人而是堅(jiān)持己見(jiàn)。

per.ti.na.cious

adj.（形容詞）
Holding tenaciously to a purpose, belief, opinion, or course of action.
堅(jiān)持的，固執(zhí)的：固執(zhí)地堅(jiān)持目標(biāo)、信仰、意見(jiàn)或行動(dòng)路線
Stubbornly or perversely persistent.See Synonyms at obstinate
頑固的：頑固地或剛愎地堅(jiān)持的參見(jiàn) obstinate

來(lái)源：
From Latin pertin3x pertin3c-
源自 拉丁語(yǔ) pertin3x pertin3c-
per- [per-]
per- [前綴，表示.極，完全.等意]
ten3x [tenacious] from tenôre [to hold] * see ten-
ten3x [固執(zhí)的] 源自 tenôre [堅(jiān)持] *參見(jiàn) ten-

【引伸】
per.tina.ciously
adv.（副詞）
per.tina.ciousness
n.（名詞）