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1. Showing or having an insensitive and cruel disregard for others
2. Having a thickened and hardened part of the skin
1. Thanos showed a callous indifference to the fate of the universe, willing to destroy half of all life.
2. Batman's callous exterior hides a compassionate hero who deeply cares for Gotham.
3. Constantly working with heavy machinery left the mechanic with a callous on his hand.
4. Despite his mischievous behavior, Shinchan is not really callous; he often shows kindness in his own way.