bottomless       
adjective uk/ˈbɒt.əm.ləs/ us/ˈbɑː.t̬əm.ləs/
 无底的;极深的;深不可测的;无限的
without a limit or end
  She had a bottomless hunger for learning.
 The generosity of the local people is bottomless. 当地人热情无比。 
 - More examples
 - They looked out on a murky, bottomless lake.
 - He said that the university's pockets were not bottomless.
 - They face bottomless legal expenses.
 - They were impressed by his seemingly bottomless knowledge of birds.
 - The ticket price includes live music and a bottomless keg of beer.