punctilious /ˌpʌŋkˈtɪlijəs/ adjective /ˌpʌŋkˈtɪlijəs/
adjective
Learner's definition of PUNCTILIOUS
[more punctilious; most punctilious] formal
: very careful about behaving properly and doing things in a correct and accurate way一丝不苟的;谨慎细心的
— punctiliousness
noun [noncount]