rigid, strict, rigorous

形容詞 rigid:

1. incapable of or resistant to bending
   同義詞：stiff
2. incapable of compromise or flexibility
   同義詞：strict
3. incapable of adapting or changing to meet circumstances
   同義詞：inflexible, unbending
4. fixed and unmoving
   同義詞：fixed, set
5. designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure

1. Beliefs have ossified into rigid dogma.
   信仰已僵化為不可更動的教條。
2. The caste refers to social system based on rigid distinctions of birth, rank, wealth, etc.
   社會等級是指按照血統(tǒng)，階級，財富等嚴格區(qū)分的社會制度。
3. It's an exercise which adds a touch of the comic opera to his rigid training routines.
   這一練習給他那刻板的訓練程序平添了一份滑稽的色彩。
4. He's very rigid in his ideas.
   他的想法非常固執(zhí)。
5. She was rigid with fear.
   她害怕得全身僵住了。

rig.id

adj.（形容詞）
Not flexible or pliant; stiff.
具剛性的：不可彎曲或不柔順的；堅硬的
Not moving; fixed.
堅定不移的；固定的
Marked by a lack of flexibility; rigorous and exacting:
呆板的，僵硬的，苛嚴的：以缺乏柔韌性為特征的；嚴格苛刻的：
例句：
.We have watered down a rigid training . . . until we now have an educational diet in many of our public high schools that nourishes neither the classes nor the masses.(Agnes Meyer)
.我們已經減輕了這種乏味嚴格訓練的強度，…直到現在我們還在許多既沒有使階級也使大眾繁榮的公立高中里受教育.(阿格尼斯·梅爾)

Scrupulously maintained or performed:
固執(zhí)僵化的，刻板的：僵化地保持或執(zhí)行的：
例句：
rigid discipline.See Synonyms at stiff
固執(zhí)僵化的紀律參見 stiff

來源：
Middle English rigide
中古英語 rigide
from Latin rigidus
源自 拉丁語 rigidus
from rigôre [to be stiff] * see reig-
源自 rigôre [僵硬的] *參見 reig-

【引伸】
rig.idly
adv.（副詞）
rig.idness
n.（名詞）