The crossword solution for the term 'LESS OBVIOUS' is 'SUBTLER' (7 letters). The term 'subtler' means something that is not easily noticed or understood, and is often used to describe a subtle difference between two things. It is the opposite of 'OBVIOUS, ' which means something that is easily noticed or understood. Therefore, the term 'less OBVIOUS' can be defined as something that is not easily noticed or understood.