Thoroughgoing, exhaustive (2,5)
I believe the answer is:
in depth
(Other definitions for in depth that I've seen before include "Profoundly" , "Thoroughly and comprehensively" , "full" , "Penetrating" , "Not 16 [SHALLOW], anyway" .)
I believe the answer is:
in depth
(Other definitions for in depth that I've seen before include "Profoundly" , "Thoroughly and comprehensively" , "full" , "Penetrating" , "Not 16 [SHALLOW], anyway" .)