Pronunciation: [ puhngk-til-ee-uhs ]
Definition: adjective
extremely attentive to punctilios; strict or exact in the observance of the formalities or amenities of conduct or actions; showing great attention to detail or correct behavior

Origin: Mid 17th century; Italian
Etymology: from French pointilleux, from pointille, from Italian puntiglio
Usage:

Synonyms:
ceremonious
conventional
exact
formal
formalistic
meticulous
Antonyms:
careless
easy-going
informal
uncaring
Example:
The man was uniquely punctilious about his obligations.