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Adjective: arrant  er-unt [N. Amer], a-runt [Brit]
  1. Without qualification; used informally as an (often pejorative) intensifier
    "an arrant fool";
    - complete, consummate, double-dyed, everlasting, gross, perfect, pure, sodding, stark, staring, thorough, thoroughgoing, utter, unadulterated, rigorous

See also: unmitigated