perpetual

adj.

[1]	eternal , ageless , aeonian , infinite , everlasting , eonian , eternal , never-ending , unending , everlasting , unending , perennial , ageless , unceasing , timeless , long-lived , permanent , unceasing , lasting , enduring , unvarying , unchanging , immutable , invariable , undeviating , (Literary) sempiternal
[2]	constant , ceaseless , constant , uninterrupted , continuous , incessant , never-ending , unfailing , incessant , unceasing , unremitting , persistent , unremitting , unending , non-stop , endless , recurrent , continual , repetitive