Punctilious
Punctilious (-yus) , adjective
[Compare Italian puntiglioso, Sp. puntilloso.]
Attentive to punctilio; very nice or exact in the forms of behavior, etiquette, or mutual intercourse; precise; exact in the smallest particulars.
A punctilious observance of divine laws.
Very punctilious copies of any letters.
Punctilious in the simple and intelligible instances of common life.