(a.) Without a seam.

articulated catenated ceaseless concatenated connected constant continual continued continuing continuous cyclical direct endless featureless gapless immediate incessant interminable joined jointless linked monotonous never-ending nonstop perennial periodic recurrent repetitive round-the-clock running serried smooth stable steady straight twenty-four-hour unbroken unceasing undifferentiated unending uniform unintermitted unintermittent unintermitting uninterrupted unrelieved unremitting unstopped