Comprehensive, thorough (2-5)
I believe the answer is:
in-depth
I believe this is a double definition.
'comprehensive' is the first definition.
(I've seen this before)
'thorough' is the second definition.
(I've seen this before)
(Other definitions for in-depth that I've seen before include "Comprehensive and thorough" , "Thoroughly and comprehensively" , "Thorough and intensive" , "searching" , "Getting to the bottom of it" .)