torpor
noun [ U ] uk/ˈtɔː.pər/ us/ˈtɔːr.pɚ/ (also torpidity, uk/tɔːˈpɪd.ə.ti/ us/tɔːrˈpɪd.ə.t̬i/)
formal不活跃；萎靡；迟钝
the state of not being active and having no energy or enthusiasm
biology specialized（冬季动物的）蛰伏
the state of reduced activity that some animals experience during the winter