Indecent matter is a term used to describe material that is considered to be offensive or inappropriate. The term can be used to refer to a variety of different types of content, including pornography, profanity, and other forms of offensive language. The crossword solution for the term 'indecent matter' is 'SMUT, ' which is a slang term for pornographic material. SMUT is often used to describe material that is considered to be sexually explicit or offensive.