"Whatsoever" is an adverb used to add emphasis to the idea that is being expressed, especially after a negative phrase. It is an intensive form of "whatever" and can be used to mean "whatever it be; in any place whatsoever". The word "whatsoever" was first used in the thirteenth century and is rare these days. It is used to emphasize the lack of restriction or qualification in a statement, and it can be used to mean "at all" or "in any way". For example, "I have no interest whatsoever in watching that movie" means that the speaker has absolutely no interest in watching the movie.