動詞 callous:

1. make insensitive or callous; deaden feelings or morals
   同義詞：cauterize, cauterise

形容詞 callous:

1. emotionally hardened
   同義詞：indurate, pachydermatous
2. having calluses; having skin made tough and thick through wear
   同義詞：calloused, thickened

1. A callous indifference to the suffering of others.
   對他人之痛苦漠不關(guān)心的鐵石心腸的人

cal.lous

adj.（形容詞）
Having calluses; toughened:
結(jié)繭的：長有繭的；結(jié)硬的：
例句：
callous skin on the elbow.
肘部的結(jié)繭

Emotionally hardened; unfeeling:
鐵石心腸的：情感冷漠的；無情的：
例句：
a callous indifference to the suffering of others.
對他人之痛苦漠不關(guān)心的鐵石心腸的人

v.tr.intr.（及物動詞和不及物動詞）
cal.loused,cal.lous.ing,cal.lous.es
To make or become callous.
變硬：使變硬或變硬結(jié)繭

來源：
Middle English
中古英語
from Old French cailleux
源自 古法語 cailleux
from Latin callôsus
源自 拉丁語 callôsus
from callum [hard skin]
源自 callum [硬的皮]

【引伸】
cal.lously
adv.（副詞）
cal.lousness
n.（名詞）
Do not confuse the adjectivecallous, as in Years of dealing with criminals had left her callous, with the noun callus, as inI have a callus on my thumb. The verbscallous and callus mean respectively .to make or become callous. and .to form or develop hardened tissue..
不要把形容詞callous ，如句子 數(shù)年與罪犯打交道的經(jīng)歷使她心腸硬起來了， 與名詞 callus 相混淆， 如下句我拇指上結(jié)繭了。 動詞callous 與 callus 分別指為.使變硬或成為結(jié)繭的.和.形成或發(fā)展已變硬的組織.