The crossword solutions for the term 'TOUGH TO OUTWIT' are ASTUTE (6 letters) and FOXY (4 letters). ASTUTE means having or showing an ability to accurately assess situations or people and turn that to one's advantage. It is often used to describe someone who is clever and quick-witted. FOXY, on the other hand, is a slang term used to describe someone who is attractive, clever, and cunning. Both of these words can be used to describe someone who is difficult to outwit.