Definition of punctilious adjective from the Oxford Advanced Learner's Dictionary

 

punctilious

 adjective
adjective
BrE BrE//pʌŋkˈtɪliəs//
 
; NAmE NAmE//pʌŋkˈtɪliəs//
 
(formal)
 
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very careful to behave correctly or to perform your duties exactly as you should a punctilious host Word Origin mid 17th cent.: from French pointilleux, from pointille, from Italian puntiglio, diminutive of punto ‘a point’.
See the Oxford Advanced American Dictionary entry: punctilious