The crossword solution for the term 'UTTERLY AMAZE' is 'FLOOR'. The word 'FLOOR' is a noun that refers to the bottom surface of a room or other space. It is usually made of wood, concrete, or other materials. It is also used as a verb, meaning to surprise or shock someone greatly. Therefore, the term 'utterly amaze' can be used to describe the act of surprising or shocking someone greatly, which is represented by the crossword solution 'FLOOR'.