邓阳的回答：
cruelty is adverb.
cruelness is noun
冬之梅的回答：
cruelty n. 残忍, 残酷 英英解释:名词cruelty:
1. a cruel act; a deliberate infliction of pain and suffering
同义词：inhuman treatment
2. feelings of extreme heartlessness
同义词：mercilessness, pitilessness, ruthlessness
3. the quality of being cruel and causing tension or annoyance
同义词：cruelness, harshness
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