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niṣṭhur a merciless, ruthless [पिता father, पति husband, स्वामी master]. [also निष्ठुरह्रदय]

niṣṭhur·tā fu mercilessness, ruthlessness: ह्रदय की ~ -- of heart; स्वामी की नौकर के प्रति ~ -- of a master towards his servant.