The term 'walk furtively' can be described by the crossword solutions of TIPTOE (6 letters), SIDLE (5 letters), and SLINK (5 letters). Tiptoeing is a way of walking on the balls of the feet, making as little noise as possible. Sidling is a type of movement where one moves sideways, often in a stealthy manner. Slinking is a type of movement that is characterized by a low, crouching posture and a slow, sinuous gait. All three of these words describe a way of walking that is done in a secretive or stealthy manner.