Marked by quiet and caution and secrecy; taking pains to avoid being observed. Synonyms:furtive, sneak, stealthy, surreptitious."A sneak attack" , "Stealthy footsteps" , "A surreptitious glance at his watch"
... besides, he felt just a bit sneaky at being such a big boy and doing so little to help, so he said, "Cheer up! Cheer up! I'll go and get work somewhere." And he felt as he spoke as if he would work his fingers to the bone; but the good ... — English Fairy Tales • Flora Annie Steel
... loudly. "You mustn't tell; you must not! It's mean. Only sneaky children repeat what is said in private. Promise this minute that you ... — A College Girl • Mrs. George de Horne Vaizey