Source : WordNet®

goon
     n 1: an awkward stupid person [syn: {lout}, {clod}, {stumblebum},
           {oaf}, {lubber}, {lummox}, {lump}, {gawk}]
     2: an aggressive and violent young criminal [syn: {hood}, {hoodlum},
         {punk}, {thug}, {tough}, {toughie}, {strong-armer}]