thor ‧ ough ‧ go ‧ ing /ˌθʌrəˈɡəʊɪŋ◂ $ -ˈɡoʊ-/ BrE AmE adjective formal
1 . very thorough and careful:
a thoroughgoing analysis of the data
2 . [only before noun] a thoroughgoing action or quality is complete:
The programme has been a thoroughgoing success.