unending Synonyms

eternal unceasing eonian everlasting perpetual ageless aeonian perennial tedious termless timeless unbounded unbroken undying steady sisyphean sesquipedalian permanent perdurable persisting persistent protracted relentless renewable ongoing sempiternal unrelenting long-lasting drawn-out long-term nonfinite immeasurate neverending non-stop unrelieved run on unfading unremitting uninterrupted never-ending unchanging agelong around the clock round the clock nonstop without end amaranthine cyclical dateless deathless