thoroughgoing in WordNet English dictionary

1. without qualification; used informally as (often pejorative) intensifiers
   "an arrant fool"; "a complete coward"; "a consummate fool"; "a double-dyed villain"; "gross negligence"; "a perfect idiot"; "pure folly"; "what a sodding mess"; "stark staring mad"; "a thoroughgoing villain"; "utter nonsense"; "the unadulterated truth"
   arrant  complete  consummate  double-dyed  everlasting  gross  perfect  pure  sodding  stark  staring  thoroughgoing  utter  unadulterated 
   
2. performed comprehensively and completely
   "an exhaustive study"; "made a thorough search"; "thoroughgoing research"
   exhaustive  thorough  thoroughgoing