形容詞 inflexible:

1. incapable of change
2. not making concessions
   同義詞：uncompromising, sturdy
3. resistant to being bent;
4. incapable of adapting or changing to meet circumstances
   同義詞：rigid, unbending

1. Not bending; inflexible.
   堅挺的不能彎曲的; 堅挺的
2. Stubbornly prejudiced, narrow-minded, or inflexible.
   思想偏狹頑固的、迂腐的或守舊的

in.flex.i.ble

adj.（形容詞）
Not easily bent; stiff or rigid.
不易彎的，僵硬的：不易變曲的；強硬或生硬的
Incapable of being changed; unalterable.
不可能被改變的；不可變的
Unyielding in purpose, principle, or temper; immovable.
不屈撓的，不退讓的：在目標、原則或個性上不屈撓的；堅定不可動搖的

【引伸】
inflex.ibil.ity 或
inflex.ibleness
n.（名詞）
inflex.ibly
adv.（副詞）
<參考詞匯><同義詞>inflexible,inexorable,adamant,obdurateThese adjectives mean not capable of being swayed or diverted from a course.
這些形容詞表示不從既定路線上偏離或改變的。
Inflexible implies unyielding adherence to rigidly fixed principles or purposes:
inflexible 意指堅決遵照固定的原則或目標：
例句：
Polite but inflexible, she would not be deflected from her intention.
她禮貌但很堅決，絕不放棄自己的目標。

Inexorable implies lack of susceptibility to persuasion or entreaty:
Inexorable 意指難以說服，又不接受懇求：
例句：
.Cynthia was inexorable—she would have none of him. (Winston Churchill).The term also describes things, such as fate and law, that are inevitable, relentless, and often severe in effect:
辛西亞毫不動搖——她不要他的任何東西 （溫斯頓·丘吉爾）。該詞也用于描述事物（如具有不可抗力），通常有嚴峻效果的命運和法律：

例句：
.Russia`s final hour, it seemed, approached with inexorable certainty. (W. Bruce Lincoln).
俄羅斯的最后時刻，好象到了最嚴峻的時刻 (W·布魯斯·林肯）。

Adamant usually implies imperviousness to pleas or appeals:
Adamant 通常暗示對請求或呼吁無動于衷：
例句：
He is adamant in his refusal to change his mind.
他毫不留情地拒絕改變主意。

Obdurate adds toadamant the implication of hard, unfeeling resistance to tender feelings:
Obdurate 一詞在adamant 一詞上又附加了一種不近人情的、冷酷無情的含義：
例句：
The child`s misery would move even the most obdurate heart. See also Synonyms at stiff
這個孩子所受的苦難會打動世界上最冷酷的心 參見同義詞 stiff