MISUSE' (5 letters) The term 'improper use' can be broken down into two crossword solutions: 'ABUSE' and 'MISUSE'. ABUSE is defined as the improper treatment of a person or thing, often involving physical violence or emotional harm. MISUSE is defined as the incorrect or inappropriate application of something, usually with negative consequences. Both terms are related to the concept of improper use, as they both involve the incorrect application of something, whether it be a person, object, or idea.