Definition: The slang term we're looking for is "non-adherence," and the example sentence could be:

Non-adherence means you don’t follow through on your promises or commitments. For instance, when I made a promise to help my friend with her homework, I didn't actually do it! Non-adherence can lead to frustration because I end up wasting time and resources that could have been used for something else. Example sentence: "Non-adherence is like being late for an appointment—everytime. If you're going to be there in 10 minutes, don't just show up half way."