meticulous
adjective approving uk/məˈtɪk.jə.ləs/ us/məˈtɪk.jə.ləs/
C2 严谨的，一丝不苟的；非常注意细节的
very careful and with great attention to every detail
Many hours of meticulous preparation have gone into writing the book. 为写此书，已投入了大量时间做细致的前期准备。