lassitude

After hiking for twelve hours in the hot sun, a deep sense of lassitude overwhelmed the entire group.

(Chinese) 在烈日下徒步十二小时后，深深的疲惫感席卷了整个团队。

The symptoms of the tropical illness include a high fever followed by a long period of general lassitude.

(Chinese) 该热带疾病的症状包括高烧，随后是长时间的普遍乏力。