punctilious - Definitions from Dictionary.com (eytmology):

punctilious (puhnk-TIL-ee-uhs) adjective

1. Strictly attentive to minute details of form in action or conduct. See Synonyms at meticulous.
2. Precise; scrupulous.

Source: The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2000 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

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adj : marked by precise accordance with details; “was worryingly meticulous about trivial details”; “punctilious in his attention to rules of etiquette” [syn: meticulous]

Source: WordNet ® 2.0, © 2003 Princeton University