Pretty outrageous. National Geographic explains why so many words are attributed to Shakespeare:
Despite Shakespeare’s apparently considerable contributions to the language, Macrone and other academics are quick to caution that it is almost impossible say with absolutely certainty when a word or phrase was first used—or even whom to credit for creating it. In Shakespeare’s case, many of the words and phrases attributed to him merely debuted in their modern permutations in his writings and can actually be traced back to older forms. Other words and turns of phrase are indeed “original,” insomuch as they are documented in the written record only as far back as Shakespeare.