[mass noun]a lack of energy and enthusiasm 无精打采,无力 there was an air of lethargy about him. 他一副没精打采的样子。 [in sing.]she might have sunk into a lethargy. 她可能陷入了一种缺少活力的状态。 ■(Medicine)a pathological state of sleepiness or deep unresponsiveness and inactivity (医)昏睡,嗜眠
语源
late Middle English: via Old French from late Latin lethargia, from Greek lēthargia, from lēthargos 'forgetful', from the base of lanthanesthai 'forget'