bliss

 
Pronunciation: /blɪs/

noun

[mass noun]
  • perfect happiness; great joy: she gave a sigh of bliss
  • a state of spiritual blessedness, typically that reached after death: the bliss of heaven

verb

[no object] (bliss out or be blissed out) informal
  • reach a state of perfect happiness, oblivious of everything else: Josh is just blissed out, always smiling [as adjective]: blissed-out hippies

Origin:

Old English blīths, bliss, of Germanic origin; related to blithe