IPA: /pʌŋkˈtɪl.i.əs.li/
KK: /pʌŋkˈtɪlɪəsli/
In a way that shows great attention to detail or correct behavior.
She punctiliously followed the rules during the meeting.
Punctiliously → It is formed from "punctilious" (from Latin *punctiliosus*, meaning careful or precise) and the suffix "-ly" (meaning in a manner of). The word "punctiliously" means in a careful or precise manner, often regarding details or etiquette.
Think of being very 'careful' and 'precise' — 'punctilious' describes someone who pays great attention to detail, and '-ly' indicates the manner in which they do so.