unceasing in WordNet English dictionary

1. continuing forever or indefinitely
   "the ageless themes of love and revenge"; "eternal truths"; "life everlasting"; "hell's perpetual fires"; "the unending bliss of heaven"
   ageless  aeonian  eonian  eternal  everlasting  perpetual  unending  unceasing 
   
2. uninterrupted in time and indefinitely long continuing
   "the ceaseless thunder of surf"; "in constant pain"; "night and day we live with the incessant noise of the city"; "the never-ending search for happiness"; "the perpetual struggle to maintain standards in a democracy"; "man's unceasing warfare with drought and isolation"; "unremitting demands of hunger"
   ceaseless  constant  incessant  never-ending  perpetual  unceasing  unremitting 
   

unceasing in English Wiktionary