adjective satellite (s)

• showing sustained enthusiastic action with unflagging vitality(adj.all)

  Example:
  Unflagging pursuit of excellence.
  

  Synonym:
  indefatigable, tireless, unwearying
  

  source: wordnet30
• unceasing(adj.all)

  Example:
  Unflagging courtesy.
  

  Synonym:
  abiding, enduring, imperishable, unfailing
  

  source: wordnet30