never stops
- endlessWithout termination or boundary
- relentlessContinuing without pause
- perpetualLasting without interruption
- ceaselessWithout interruption or end
- constantFixed, unvarying quantity
continuous · eternal · tireless · persistent · unstoppable · marathon · energizer · infinite · nonstop · ongoing · ticking · flowing · running · grinding · pounding · heartbeat · river · engine
continuity/persistence
never stopsceases
Discontinues or terminates
halts · ends · terminates · quits · discontinues
frequency/regularity
never stopsinfrequent
Happening only occasionally
once in a blue moon · hardly ever · occasional · sporadic · scarcely