1. 唯命是从之徒；哈巴狗；应声虫
If you describe someone as a lackey, you are critical of them because they follow someone's orders completely, without ever questioning them.

1. a male servant (especially a footman)

Synonym: flunkyflunkey

2. a person who tries to please someone in order to gain a personal advantage

Synonym: sycophanttoadycrawlerass-kisser