Obsequious is an adjective that describes someone who is overly eager to please or submit to someone else's wishes. There are several synonyms for this word, including servile, subservient, fawning, ingratiating, sycophantic, and groveling. All of these words convey the idea of someone who is willing to do almost anything to gain favor with someone in a position of power or authority. They can also be used to describe behavior that is excessively polite, deferential, or deferent. While each of these words has a slightly different connotation, they all convey the sense of someone who is overly eager to please.