They are callous, lack empathy and cannot easily differentiate between people and objects.
"It's not that they're callous or they don't care.
People are very selfish, I find, or rather, they are callous.
Detective superintendent Craig Turner, head of the Flying Squad that saved Scotland Yard's blushes by cracking the case after police ignored an alarm triggered by the gang, rubbished the idea the gang were cuddly pensioners: "They are callous career criminals".
They're callous and feeble cartoons, cooked up as a provocation by a conservative newspaper exploiting the general Muslim prohibition on images of the Prophet Muhammad to score cheap points about freedom of expression.
It might mean they are callous and want to lose on purpose.
The video has become an Internet sensation, with defenders saying the soldiers believed they were under threat and critics denouncing what they said were callous and bloodthirsty comments by the soldiers as they killed about a dozen people.
While Armstrong's comments were callous, they aren't all that surprising.
Hungarian officials were callous and uncomprehending.
Family members have been locked in a battle with Children's Hospital & Research Center Oakland, which they accuse of being callous in pushing to take Jahi off a ventilator, despite their wishes to continue her life support.
