adj .
sneaky ; secret 몰래 하는 ; 비밀의

• The dinner guest surreptitiously slipped a few silver spoons into his jacket as he was leaving the dining room.
• The baby-sitter mixed herself a surreptitious cocktail as soon as Mr. and Mrs. Robinson had driven away.
  베이비시터는 로빈슨 부부가 차를 몰고 나가자마자, 비밀스런 칵테일을 만들어 먹었다.