1. conscientious; very careful
1. He is known to be extremely scrupulous in the carrying out of his professional duties.
2. Together we all made a scrupulous search of the whole house, but still couldn't find the missing necklace.
scrupulus (small sharp stone, uneasiness, anxiety, pricking of conscience) (Latin)
fastidious, meticulous, punctilious, scrupulous
It makes you think of sculpture and while building sculpture the worker has to be very careful