形容詞 insensible:

1. incapable of physical sensation
2. unaware of or indifferent to
   同義詞：unaffected
3. barely able to be perceived
   同義詞：indiscernible, undetectable
4. unresponsive to stimulation
   同義詞：senseless

1. He was insensible of the danger.
   他沒有察覺到危險。
2. Nature has hardly formed a woman ugly enough to be insensible to flattery upon her person.
   一個女人再怎么難看，聽到人家恭維自己的容貌也會很開心，與此相反的女人上帝還沒造出來呢。
3. She couldn't restrain her anger at this insensible attitude of theirs.
   對他們這種無動于衷的態(tài)度，她抑制不住心頭的怒火。
4. He was insensible of his danger.
   他沒有感覺到面臨的危險。

in.sen.si.ble

adj.（形容詞）

Imperceptible; inappreciable:
感覺不到的；難以覺察的：
例句：
an insensible change in temperature.
難以覺察的溫度變化

Very small or gradual:
漸進的：很小的或逐漸的：
例句：
insensible movement.
微小的運動

Having lost consciousness, especially temporarily; unconscious:
無感覺的：失去知覺的，尤其是暫時的；昏迷的：
例句：
lay insensible where he had fallen.
他暈倒在跌倒的地方

Not invested with sensation; inanimate:
無感覺，無生命的：
例句：
insensible clay.
無生命的泥土

Devoid of physical sensation or the power to react, as to pain or cold; numb.
失去知覺的：缺乏生理感覺或的，如缺乏對疼痛或冷的反應能力；麻木的

Unaware; unmindful:
無察覺的；不注意的：
例句：
I am not insensible of your concern.
我不是沒察覺到你的憂慮

Not emotionally responsive; indifferent:
無情感上的反應的；無動于衷的：
例句：
insensible to criticism.
對批評無動于衷

Lacking meaning; unintelligible.
不明白的；難以理解的

來源：
Middle English
中古英語
from Old French
源自 古法語
from Latin onsônsibilis [imperceivable]
源自 拉丁語 onsônsibilis [覺察不到的]
in- [not] * see in-
in- [不] *參見 in-
sônsibilis [perceptible] * see sensible
sônsibilis [察覺得到的] *參見 sensible

【引伸】
insen.sibil.ity 或
insen.sibleness
n.（名詞）
insen.sibly
adv.（副詞）