callous

动词 callous:

1. make insensitive or callous; deaden feelings or morals
   同义词：cauterize, cauterise

形容词 callous:

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

1. A callous indifference to the suffering of others.
   对他人之痛苦漠不关心的铁石心肠的人

cal.lous

adj.（形容词）
Having calluses; toughened:
结茧的：长有茧的；结硬的：
例句：
callous skin on the elbow.
肘部的结茧

Emotionally hardened; unfeeling:
铁石心肠的：情感冷漠的；无情的：
例句：
a callous indifference to the suffering of others.
对他人之痛苦漠不关心的铁石心肠的人

v.tr.intr.（及物动词和不及物动词）
cal.loused,cal.lous.ing,cal.lous.es
To make or become callous.
变硬：使变硬或变硬结茧

来源：
Middle English
中古英语
from Old French cailleux
源自 古法语 cailleux
from Latin callôsus
源自 拉丁语 callôsus
from callum [hard skin]
源自 callum [硬的皮]

【引伸】
cal.lously
adv.（副词）
cal.lousness
n.（名词）
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..
不要把形容词callous ，如句子 数年与罪犯打交道的经历使她心肠硬起来了， 与名词 callus 相混淆， 如下句我拇指上结茧了。 动词callous 与 callus 分别指为.使变硬或成为结茧的.和.形成或发展已变硬的组织.