Use the adjective endurable to describe something that's no fun, but that a person can generally deal with. Standardized tests are endurable, and eating soggy, overcooked broccoli is endurable.

What is an endurable?

: capable of being endured : bearable.

Is grinding an adverb or adjective?

grind·a·ble, adjectivegrind·a·bil·i·ty, noungrind·ing·ly, adverbre·grind, verb, re·ground, re·grind·ing.