ἔγνω δὲ φώρ τε φῶρα καὶ λύκος λύκον → the thief knows the thief and the wolf knows the wolf, and thief knows thief and wolf his fellow wolf, set a thief to catch a thief
schonungslos, inclemens (unglimpflich). – acer (streng). – acerbus (mit kränkender Härte verfahrend, z.B. bei Einkassierung von Geldern, in exigendo). – crudelis (grausam). – Adv.inclementer; acerbe; acriter; crudeliter.