sneakingly
  (ad.)祕密地;卑鄙地;暗地
  Sneak·ing, a. Marked by cowardly concealment; deficient in openness and courage; underhand; mean; crouching. -- Sneak*ing*ly, adv. -- Sneak*ing*ness, n.
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  sneakingly
       adv : in a sneaky manner; "I always felt sneakingly that I wanted
             to be a concert pianist"