painfully          
adverb uk/ˈpeɪn.fəl.i/ us/ˈpeɪn.fəl.i/
 痛苦地
in a way that causes pain
  Without surgery, this animal will die slowly and painfully. 不做手术的话,这只动物会缓慢而痛苦地死去。 
  令人不快地,讨厌地
used to emphasize a quality, action, or situation that is unpleasant or not wanted
  I am painfully aware that I have made mistakes. 我痛苦地意识到自己犯了错误。 
 It was a painfully slow journey. 那是一次慢得让人难受的旅程。