sinking

Noun

• a feeling caused by uneasiness or apprehension
  • with a sinking heart
    
  • a sinking feeling in the pit of my stomach
    

• a slow fall or decline (as for lack of strength)
  • after several hours of sinking an unexpected rally rescued the market
    
  • he could not control the sinking of his legs
    

• a descent as through liquid (especially through water)
  • they still talk about the sinking of the Titanic