toothachingly

adverb3

1. •
   So as to cause toothache.

   • Sweeter still — almost toothachingly so — are chongos zamoranos, a curious confection invented in Zamora in which milk, sugar and spices are boiled for about five days then laid away in syrup. — 1972
2. •
   Overly in possession of an otherwise positive trait.
3. •
   Painfully, irritatingly.

   • Have you ever wondered how it is possible for someone to drive a motorised vehicle so toothachingly, nerverenderingly slow? — 2009