Slyness, Moving Cautiously to Go Unnoticed
Puzzle 14 of Solving a Mystery Easy Pack
Question is: Slyness, Moving Cautiously to Go Unnoticed
and the answer is: STEALTH
Word Meaning:
STEALTH — (uncountable) The attribute or characteristic of acting in secrecy, or in such a way that the actions are unnoticed or difficult to detect by others.
Definitions from Wiktionary.