• (a.) Attentive to punctilio; very nice or exact in the forms of behavior, etiquette, or mutual intercourse; precise; exact in the smallest particulars. Found on http://thinkexist.com/dictionary/meaning/punctilious/
Punc·til'ious (-yŭs) adjective [ Confer Italian puntiglioso , Spanish 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.' Found on http://www.encyclo.co.uk/webster/P/195