heartlessly
Definitions
In a manner lacking pity, compassion, or kindness.
Without regard for the feelings or suffering of others.
Examples
The villain heartlessly abandoned his loyal companion in the middle of the desert.
She heartlessly dismissed his sincere apology without even looking him in the eye.
Synonyms
cruelly mercilessly callously ruthlessly coldly pitilessly unsympathetically
Antonyms
compassionately kindly mercifully tenderly warmly sympathetically humanely