Heart·less, a.
1. Without a heart.
You have left me heartless; mine is in your bosom. --J. Webster.
2. Destitute of courage; spiritless; despondent.
Heartless they fought, and quitted soon their ground. --Dryden.
Heartless and melancholy. --W. Irwing.
3. Destitute of feeling or affection; unsympathetic; cruel. “The heartless parasites.”
-- Heart*less*ly, adv. -- Heart*less*ness, n.
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heartlessly
adv : in a heartless manner; "she behaves rather heartlessly
toward her admirers"