STEALTHY
furtive, sneak, sneaky, stealthy, surreptitious
(adjective) marked by quiet and caution and secrecy; taking pains to avoid being observed; “a furtive manner”; “a sneak attack”; “stealthy footsteps”; “a surreptitious glance at his watch”
Source: WordNet® 3.1
Etymology
Adjective
stealthy (comparative stealthier, superlative stealthiest)
Characterized by or resembling stealth or secrecy.
Synonyms
• sneaking
• undercover
• concealed
• See also covert
Anagrams
• Hayslett
Source: Wiktionary
Stealth"y, a. [Compar. Stealthier; superl. Stealthiest.]
Definition: Done by stealth; accomplished clandestinely; unperceived;
secret; furtive; sly.
[Withered murder] with his stealthy pace, . . . Moves like a ghost.
Shak.
Source: Webster’s Unabridged Dictionary 1913 Edition