breath·tak·ing
 /ˈbrɛθˌteıkıŋ/  adj   [more ~; most ~]
  1 : very exciting : thrilling
   The train raced past with breathtaking speed.
   They gave a breathtaking performance.
   The view of the mountains was breathtaking.
   a scene of breathtaking beauty
  2 : very great or surprising
   his breathtaking ignorance
   The scope of the error is breathtaking.
  breath·tak·ing·ly  adv  
   a breathtakingly beautiful view