sloth [sləʊθ]

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n.[动]树懒；懒惰，懒散

unwillingness to work or make any effort

Absence of competition makes for sloth. 没有竞争会导致懒惰。
The sloth spends most of its time hanging upside down from the branches. 大部分时间里树懒都是倒挂在树枝上。