The term 'SPEAKS INDISTINCTLY' can be summarized by two crossword solutions: 'SLURS' (5 letters) and 'MUTTERS' (7 letters). Slurring is a speech impediment that causes the speaker to speak in an unclear or indistinct manner, often due to a lack of control over the muscles used for speech. Muttering is a form of low-volume speaking, usually done under one's breath, which makes it difficult to understand what is being said. Both of these terms describe someone who speaks in an indistinct manner.