punctilious - Dictionary definition and meaning for word punctilious
it is very close to word PUNCTUAL...and you pay attention to even a person who is 1 second late, that shows that you care for even very minute things too.
punctilious is a person paying attention to small punctuation mistakes in a essay(or writings)
relate with punctual. You are so much punctual that you pay attention to even 1 minute and never get late. So you are minute(ly) attentive.