exacting

adjective3

1. •
   Making great demands; difficult to satisfy.

   • His exacting taste required no small degree of outward perfection. — 1874
2. •
   Of an action, task, etc., requiring precise accuracy, great care, effort, or attention.

   • Wolf's work, which, though not very exacting, had to be done single-handed, kept him to his post. — 1897
3. •
   Of a person or organization, characterized by exaction.

   • "He is a hard, exacting, money-loving man," was my remark. — 1850