ruthless

Ruthless is a related term of unsparing.

As adjectives the difference between ruthless and unsparing

is that ruthless is without pity or compassion; cruel, pitiless while unsparing is without sparing.

As adjectives the difference between ruthless and violent

is that ruthless is without pity or compassion; cruel, pitiless while violent is involving extreme force or motion.

As a verb violent is

(archaic) to urge with violence.

As a noun violent is

(obsolete) an assailant.

Ruthless is a related term of bloodthirsty.

As adjectives the difference between ruthless and bloodthirsty

is that ruthless is without pity or compassion; cruel, pitiless while bloodthirsty is eager to resort to violence.

Ruthless is a related term of unpitying.

As adjectives the difference between ruthless and unpitying

is that ruthless is without pity or compassion; cruel, pitiless while unpitying is not feeling or showing pity.

As adjectives the difference between selfish and ruthless

is that selfish is holding one’s self-interest as the standard for decision making while ruthless is without pity or compassion; cruel, pitiless.

As an adjective ruthless

is without pity or compassion; cruel, pitiless.

As a noun selfishness is

the quality of being selfish, the condition of putting one's own interests before those of others.

As adjectives the difference between truthless and ruthless

is that truthless is lacking truth, untruthful while ruthless is without pity or compassion; cruel, pitiless.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective ruthless is

without pity or compassion; cruel, pitiless.