punctilious
词根词缀：
acupuncture n. 针灸
acu 尖 + punct 点；变尖 + ure 表行为 → 用针尖点 → 针灸
appoint v. 指派
ap 加强 + point 点；变尖 → 将尖点对准某人 → 指派
compunction n. 悔恨
com 共同 + punct 点；变尖 + ion 表名词 → 浑身像针刺一样难受 → 悔恨
disappoint v. 使失望；受挫折
dis 不 + appoint 指派 → 不〔被〕指派 → 使失望
pointer n. 指针；指示者
point 点；变尖 + er 表人或物 → 尖的东西 → 指针
punch v. 打洞
punct的变体
punctilious adj. 谨小慎微的
punct 点；变尖 + il 加强 + ious …的 →〔做事〕点滴不漏 → 谨小慎微的
punctual adj. 准时的
punct 点；变尖 + ual 有…性质的 → 卡在点上 → 准时的
punctuality n. 守时
punctual 准时的 + ity 具备某种性质，状况 → 守时
punctuate v. 加标点
punct 点；变尖 + uate → 加上点 → 加标点
puncture v. 穿孔；刺穿
punct 点；变尖 + ure 表行为 → 点〔进去〕→ 刺穿
pungent adj. 刺鼻的；尖锐的
pung 点；变尖 + ent 具有…性质的，关于…的 → 尖的 → 尖锐的
数据来源：新东方英语词汇速记大全
相关例句：
International standardization management, the advanced technique and punctilious working manner are the integral part of company's business responsibility and Minghe's business foundation.
国际标准的管理，先进的技术，一丝不苟的工作态度，是我们为用户负责，为“明禾”品牌添色的基础；
Third, even if not all consumers are as punctilious in their purchases as they say they are, there are still small, often affluent, groups that care.
第三，尽管并非所有消费者在购物时都像他们自称的那样小心谨慎，但仍有少部分（通常是富足的）群体是在意此事的。
Karina Challons, head of specialist tax at HSBC Private Bank, believes the growing hostility to evasion will have an impact on her clients, even though they are punctilious about complying with tax laws.
汇丰私人银行（hsbc private bank）专业税务负责人卡里娜夏龙（karina challons）认为，随着各国对逃税行为敌意日隆，此举将对她的客户产生影响，即便他们一丝不苟地遵守税法。
Was worryingly meticulous about trivial details; punctilious in his attention to rules of etiquette.
对琐碎的细节的恼人的关注；过于拘泥于礼仪规则的细节的。
She displayed a punctilious lack of curiosity about such things.
她出于谨慎，没有对这种事情表示好奇。
He was punctilious about being ready and waiting in the entrance hall exactly on time
他一丝不苟地作好准备并准时地在门厅等候。