incessancy (n.)

• ceaselessness
• chattering
• constancy
• continuance
• continuity
• continuousness
• durability
• endlessness
• equilibrium
• eternity
• everlastingness
• everness
• fullness
• immutability
• indestructibility
• infinity
• monotony
• oscillation
• perdurability
• permanence
• perpetuity
• plenitude
• pulsation
• rapidity
• regularity
• repetition
• sempiternity
• smoothness
• stability
• steadiness
• successiveness
• sustainment
• tattoo
• timelessness
• uniformity
• vibration