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]

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