grindy

adjective2

1. •
   (informal) Resembling or characteristic of grinding.

   • And “Old P” had stuck, for the whole of the year that Tony had had her, as her grinding day by day got grindier and her spluttering splutterier. — 1986
2. •
   (informal) Involving a lot of repetition in order to progress.

   • HGM’s writers have spent time in the grindiest of grindy Korean and Japanese free-to-plays, but Free Realms is something new and different and better. — 2009