Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Origin: punctilio 'detail of good behavior' (16-21 centuries), from Italian puntiglio, from Spanish puntillo, from Latin punctum; POINT1

punctilious

 adjective
     
punc‧til‧i‧ous formal
very careful to behave correctly and follow rules
punctilious about
Joe was always punctilious about repaying loans.
—punctiliously adverb
—punctiliousness noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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