Something that is repetitive involves doing the same thing over and over again. If you get bored running on a treadmill daily, you might try something less repetitive, like playing soccer outdoors.
Anything you do repeatedly, especially when it's boring, can be described using the adjective repetitive. Jobs like loading and unloading a dishwasher, filing papers, and cleaning a bathroom can all feel repetitive when you have to do them regularly. A story your dad tells every time you have guests for dinner is repetitive, and a droning song that repeats the same chorus again and again is repetitive too.
