入微

down to the smallest detail / thoroughgoing / fine and detailed

down to the smallest detail; thoroughgoing; fine and detailed

to enter / to go into / to join / to become a member of / to confirm or agree with / abbr. for 入聲|入声[ru4 sheng1]

surname Wei / ancient Chinese state near present day Chongqing / Taiwan pr. [Wei2]

tiny / miniature / slightly / profound / abtruse / to decline / one millionth part of / micro- / Taiwan pr. [wei2]

to show every possible consideration (idiom); meticulous care

to emphasize down to last detail (idiom); to show every possible consideration / meticulous care