lethargic

Symptoms of the flu often include feeling extremely tired and lethargic.

(Chinese) 流感的症状通常包括感到极度疲劳和无精打采。

The hot and humid weather made everyone feel lethargic and unwilling to work.

(Chinese) 闷热潮湿的天气让每个人都感到无精打采，不想工作。