Heartless
Part of speech: adjective
Definition: Without a heart; specifically, without feeling, emotion, or concern for others; uncaring.
Example sentence: It is among the evils of slavery that it taints the very sources of moral principle. It establishes false estimates of virtue and vice: for what can be more false and heartless than this doctrine which makes the first and holiest rights of humanity to depend upon the color of the skin?
Spiritless
Part of speech: adjective
Definition: Lacking energy, drive, motivation or emotion. Enervated.