punctilious
adjective /pʌŋkˈtɪliəs/
/pʌŋkˈtɪliəs/
(formal)- very careful to behave correctly or to perform your duties exactly as you should
- a punctilious host
Word Originmid 17th cent.: from French pointilleux, from pointille, from Italian puntiglio, diminutive of punto ‘a point’.