The term 'walk stealthily' can be summarized by two crossword solutions: SLINK (5 letters) and TIPTOE (6 letters). SLINK is an informal verb meaning to move in a smooth, sinuous manner, often with the intention of avoiding detection. TIPTOE is an action of walking on one's toes, usually done quietly or cautiously. Both words imply a quiet, careful movement, suggesting that the person is attempting to remain undetected.