Be obsequious is a term used to describe someone who is overly eager to please or flatter another person. KOWTOW and FAWN are two words that can be used to describe this behavior. KOWTOW is a verb meaning to show excessive deference or respect, usually by kneeling or bowing deeply. FAWN is a verb meaning to show excessive admiration or attention in an attempt to gain favor. Both of these words can be used to describe someone who is being obsequious.