thievishly
  (ad.)偷竊癖地;不正當地
  Thiev·ish, a.
  1. Given to stealing; addicted to theft; as, a thievish boy, a thievish magpie.
  2. Like a thief; acting by stealth; sly; secret.
     Time's thievish progress to eternity.   --Shak.
  3. Partaking of the nature of theft; accomplished by stealing; dishonest; as, a thievish practice.
  Or with a base and biosterous sword enforce
  A thievish living on the common road.   --Shak.
  -- Thiev*ish*ly, adv. -- Thiev*ish*ness, n.
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  thievishly
       adv : in a manner characteristic of a thief