His sloth was obvious as he was always late for work and had very low productivity.

sloth 是名词，来自形容词 slow（缓慢的），指"懒惰、怠惰"的行为或状态。在动物学中，sloth 也指"树懒"这种行动缓慢的动物，因此引申出"懒散"的含义。