WordNet (r) 3.0 (2006):

scot free
    adv 1: free from harm or penalty; "he went scot-free"

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "scot free":
   afoot and lighthearted, at large, at liberty, clear, detached,
   disengaged, easygoing, emancipated, escaped, fled, flown,
   footloose, footloose and fancy-free, free, free and easy,
   free as air, freeborn, freed, fugitive, go-as-you-please,
   in the clear, liberated, loose, on the loose, out of, released,
   runaway, unattached, uncommitted, unengaged, uninvolved,
   well out of