When somebody is working or studying all the time and does not spend even a little time for enjoyment (sports etc.) the he is bound to become dull (Unintelligent).
2014年3月18日
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If your lifestyle include stressful work & you do not pay attention to recreational activities then this phrase can be used.
2014年3月18日
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He becomes a boring person to know, he is no fun to be with.