uncompassionate

Uncompassionate is a related term of cruel.

As adjectives the difference between uncompassionate and cruel

is that uncompassionate is not compassionate while cruel is not nice; mean; heartless.

As a verb cruel is

to spoil or ruin (one's chance of success).

As adjectives the difference between incompassionate and uncompassionate

is that incompassionate is not compassionate; without pity or any compassion while uncompassionate is not compassionate.

As adjectives the difference between compassionate and uncompassionate

is that compassionate is having, feeling or showing compassion; sympathetic while uncompassionate is not compassionate.

As a verb compassionate

is to feel compassion for; to pity, feel sorry for.