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Adjective: supine  soo'pIn or 'soo,pIn [N. Amer], 'soo,pIn [Brit]
  1. Lying face upward
    - resupine
  2. Offering no resistance
    "No other colony showed such supine, selfish helplessness in allowing her own border citizens to be mercilessly harried";
    - resistless, unresisting

See also: inactive, passive, unerect

Encyclopedia: Supine