constant

abiding allegiant ardent around-the-clock assiduous ceaseless changeless chummy chronic commonest common consecutive conservative dependable determined devoted diligent durable earnest endless equable eternal even everlasting faithful faster fast fastest firm frequent habitual habituated hell-bent illimitable immortal immovable immutable implicit incessant inferred interminable irreversible irrevocable invariant iterative invariable lasting liege lifelong level lingering loyal measureless more even more durable more diligent more loyal more frequent more regular more peaceful more solid more uniform most loyal more natural most punctual natural never-ending nonstop old parameter peaceful perennial perpetual persistent planar protracted punctual regular resolute reliable reiterative repetitive reputable round-the-clock running same sequential sequent sempiternal solid staunch steadfast steady-going static staunchest steady steady steady successional sure surest sustained temperate timeless through traditionalistic traditionalist true tried unchanged unbroken unbounded unceasing undying undoubting undoubting unending unflagging unfailing unhesitating uninterrupted unquestioning unrelenting uniform unremitting untiring unvarying usual unuttered