punctilious

punc|tili|ous /pʌŋkt'ɪliəs/
[ADJ]
Someone who is punctilious is very careful to behave correctly. (FORMAL)
He was punctilious about being ready and waiting in the entrance hall exactly on time...
He was a punctilious young man.
punctiliously [ADV]
Given the circumstances, his behaviour to Laura had been punctiliously correct.

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