The difference between Merciless and Ruthless
When used as adjectives, merciless means showing no mercy, whereas ruthless means without pity or compassion.
check bellow for the other definitions of Merciless and Ruthless
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Merciless as an adjective:
Showing no mercy; cruel and pitiless.
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Ruthless as an adjective:
Without pity or compassion; cruel, pitiless.