The Collaborative International Dictionary
Grindingly
Grindingly \Grind"ing*ly\, adv. In a grinding manner. [Colloq.]
Wiktionary
grindingly
adv. In a grinding fashion; in a way that grinds
Usage examples of "grindingly".
And then they began to move, slowly at first, choreographing their clockwork movements to music from a grindingly slow fairground organ.
The colleges there were without exception overenrolled and grindingly ignorant.