lethargic
词根词缀：
lethal adj. 致命的
leth 遗忘 + al …的 → 最致命的伤害就是被彻底遗忘 → 致命的
lethargic adj. 昏睡的；没精打采的
leth 遗忘 + argic → 昏睡时就忘了一切 → 昏睡的
lethargy n. 昏睡
leth 遗忘 + argy → 睡着了就一切都忘了 → 昏睡
数据来源：新东方英语词汇速记大全
相关例句：
Sunday's switchover kicks off a cold, dark season, which can leave you lethargic and longing to stay under the covers, even if you've never had sleep problems in the past.
周日时制的改变标志着寒冷漆黑季节的开始，这季节使你昏昏欲睡，只想呆在家里，即使你从前从没有过睡眠问题。
Your own obsession with false-imbalances has made you lethargic and hypocritical.
对于不平衡的执著使你变得感觉迟钝并且伪善。
The weather made her listless and lethargic.
那天气弄得她百无聊赖、无精打采。
In fact, a heavy meal or one loaded with carbs can make you feel sluggish and lethargic.
事实上，大餐或者很多碳水化合物的食物会让你感到懒散乏力。
He wonders how he can throw off his lethargic holiday mood.
他想知道怎样才能摆脱掉无精打采的节日情绪。
A heavy meal may make you feel lethargic, while too few calories can result in distracting hunger pangs.
饮食过多会使你打瞌3睡，而吃的太少会导致饥饿，无法集中注意力。