Scrupulous
/ˈskruːpjələs/ adjective mediumExtremely careful and thorough about doing what is right, down to the smallest detail.
The accountant was scrupulous about documenting every expense, no matter how small.
Memory Trick
Scrupulous comes from 'scruple,' a tiny sharp pebble the Romans imagined as an uncomfortable weight on the conscience -- a scrupulous person feels every little pebble of doubt and deals with it.