困倦的英文可以用 "tired" 或 "sleepy" 来表示。
"Tired" 的来源是古英语 "tȳred"，意思是 "疲倦的"。 例如:
I'm so tired today. (今天我好累。)
He looked tired after working all day. (他工作了一整天，看起来很疲倦。)
"Sleepy" 的来源是古英语 "slæpig"，意思是 "困倦的"。 例如:
I feel sleepy now, Can I take a nap? (我现在很困，能睡个午觉吗？)
The long fpght made me feel very sleepy. (长途飞行让我感到很困。)