Eng: Stealthily...

偷

Cheat, Eavesdrop, Have an, Loaf, Peeping, Pilfer, Spy on, Steal, Stealthily

竊

Behind, Burglar, Secretely, Steal, Stealthily, Stealthy, Take, Thief, Usurp

偷偷

Secretly, Stealthily, Surreptitiously

偷偷摸摸

Covertly, Stealthily, Surreptitiously

(Secretly, Feel, Touch)