unceasing (adj.)
- abiding
- ageless
- articulated
- ceaseless
- connected
- constant
- continual
- continued
- continuing
- continuous
- cyclical
- dateless
- direct
- endless
- eternal
- everlasting
- featureless
- immediate
- immemorial
- incessant
- indefatigable
- indestructible
- infinite
- interminable
- joined
- linked
- monotonous
- never-ending
- nonstop
- oscillating
- perdurable
- perennial
- periodic
- permanent
- perpetual
- persistent
- rapid
- recurrent
- regular
- remaining
- repeated
- repetitive
- round-the-clock
- running
- seamless
- sempiternal
- serried
- smooth
- stable
- staccato
- steady
- sticking
- straight
- sustained
- timeless
- unbroken
- unchanging
- undifferentiated
- undying
- unending
- uniform
- uninterrupted
- unrelieved
- unremitting
- unvarying
