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Adjective: perpetual  pu(r)'pe-ch(oo-)ul
  1. Continuing forever or indefinitely
    "hell's perpetual fires";
    - ageless, aeonian, eonian [N. Amer], eternal, everlasting, unending, unceasing, eviternal [archaic]
  2. Continuing forever, or for an indefinitely long time
    "the perpetual struggle to maintain standards in a democracy";
    - ceaseless, constant, incessant, never-ending, unceasing, unremitting

See also: continuous, lasting, permanent, uninterrupted

Encyclopedia: Perpetual