adj.
Pronunciation: ˌ th ə r- ə - ' g ō -i ŋ , ˌ th ə -r ə -, - ' go ̇ (-)i ŋ
Function: adjective
Date: 1800
: marked by thoroughness or zeal : THOROUGH , COMPLETE < thoroughgoing changes> <a thoroughgoing traditionalist>
– thor · ough · go · ing · ly adverb