Very slender is a term used to describe something that is very THIN or narrow. The term can be broken down into three crossword solutions: THIN (4 letters), SKINNY (6 letters), and WAFERTHIN (9 letters). THIN is the most basic form of the word, meaning something that is not wide or thick. SKINNY is a more extreme version of the word, implying something that is very THIN or narrow. WAFERTHIN is the most extreme form of the word, implying something that is so THIN it is almost transparent.