dim

adj. 暗淡的, 模糊的
vt. 使暗淡, 使失去光泽
n. <美俚>笨蛋、傻子

The light was too dim for me to read easily.

光线太暗，我看书有困难。

She is rather dim about the importance of keeping records.

她不明白作记录的重要性。