Completely lacking in compassion
The man who stole from the poor was a callous thief.
Kiera looked at Evelyn, astonished by her callous words.
That was a particularly callous act, which left her left hand painful and badly bruised.
Stealing the coats was a callous act.
There was nothing heroic about Cecil or his policy; it involved a callous attitude towards struggling Protestants abroad.
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