grindingly

/ˈɡraɪndɪŋli/
adverb
  1. In a way that is harsh, scraping, or accompanied by a grinding sound.
    • The car's engine started grindingly, then finally caught.
    • He dragged the chair grindingly across the wooden floor.
    • The old gears turned grindingly, protesting every rotation.
  2. In a manner that is painfully slow, difficult, or tedious.
    • She worked grindingly through the pile of paperwork, one sheet at a time.
    • The negotiations proceeded grindingly, with no end in sight.
    • Time passed grindingly during the long, boring lecture.