punctilious

adjective2

1. •
   Strictly attentive to detail; meticulous or fastidious, particularly to codes or conventions.

   • With a punctilious slap of the gloves, the duel was now inevitable.
2. •
   Precise or scrupulous; finicky or nitpicky.

   • Of course, humans do not treat time in such a punctilious fashion. — 2009