ageless amaranthine articulated catenated chattering coeternal concatenated connected constant continual continued continuing continuous cyclical dateless direct endless eternal eterne ever-being ever-durable ever-during everlasting everliving featureless gapless immediate immemorial immortal incessant indestructible infinite interminable joined jointless linked machine gun monotonous never-ceasing never-ending nonstop nonterminating nonterminous olamic oscillating perdurable perennial periodic permanent perpetual pulsating rapid recurrent regular repeated repetitive round-the-clock running seamless sempiternal serried smooth stable staccato steady straight stuttering sustained timeless twenty-four-hour unbroken unceasing unchanging undifferentiated unending uniform unintermitted unintermittent unintermitting uninterrupted unrelieved unremitting unstopped unvarying vibrating without end