这些形容词都指缺乏趣味， 令人精神疲倦的。
These adjectives refer to what is so lacking in interest as to cause mental weariness.
这些名词所共有的中心意思是。精神疲倦、无精打采和不满的状态。
The central meaning Shared by these nouns is. A condition of mental weariness, listlessness, and discontent.
如果你到了下午觉得精神疲倦并不能保持最佳状态，我建议你打个小盹来让自己保持精力充沛做好工作准备。
If you feel a slump in the afternoon and from then on don't perform at your best, I recommend taking a short power nap to get yourself feeling alert and ready for work.
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