1. in a cruel or unkind manner; without compassion or sympathy

Examples

• She heartlessly rejected his apology without listening to a word he said.
• The villain heartlessly abandoned his loyal followers to save himself.
• He heartlessly mocked her dreams in front of everyone at the party.
• The company heartlessly laid off thousands of workers without severance.
• She spoke heartlessly about her former friend's misfortune.
• He heartlessly ignored the homeless person asking for help on the street.