noun
a noun refers to a person, place, thing, or idea. In this case, 'ruthlessness' is a noun that describes the quality of being merciless or without compassion.
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The ruler's ruthlessness in dealing with dissenters was well-known throughout the kingdom.
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Her ruthlessness in negotiations earned her a reputation as a tough negotiator.
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He showed his ruthlessness on the basketball court by trash-talking his opponents.
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The storm's ruthlessness was evident in the destruction it left behind.