The term 'Impossible to Read' can be described by two crossword solutions: 'ENCODED' (7 letters) and 'ILLEGIBLE' (9 letters). ENCODED means that something is written or communicated using a system of symbols, letters, or words, while ILLEGIBLE means that something is not able to be read or understood. Therefore, the term 'Impossible to Read' can be used to describe something that is written in a code or is so unclear that it cannot be read.