done carefully and with a lot of attention to detail (Oxford)
demanding that particular rules, processes, etc. are strictly followed (Oxford)
careful to look at or consider every part of something to make certain it is correct or safe (Cambridge)
Few people have gone into the topic in such rigorous detail. (Oxford)
They may benefit from the rigorous application of competition policy. (Oxford)
rigorous detail
rigorous application
Accurate
Uncompromising
Careless
Imprecise
Rigorously