The term 'fails to enunciate' can be defined as speaking in a way that is not clear or distinct. This can be done in two ways: by slurring words or by mumbling. Slurring is when someone speaks quickly and runs words together, making it difficult to understand what they are saying. Mumbling is when someone speaks too quietly or indistinctly, making it difficult to understand what they are saying. Both of these can make it difficult for the listener to understand the speaker.