Punc·til·ious a. 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.” --Rogers. “Very punctilious copies of any letters.” --The Nation.
Punctilious in the simple and intelligible instances of common life. --I. Taylor.
-- Punc*til*ious*ly, adv. -- Punc*til*ious*ness, n.
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punctiliously
adv : in a punctilious manner; "he launched into a long history of
the birth of communism, giving credit punctiliously to
the work of Marx and Engels"