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Adjective: uncoloured  ,ún'kú-lu(r)d
Usage: Brit, Cdn (US: uncolored)
  1. Without colour
    "pure water is uncoloured";
    - uncolored [US]
  2. Not artificially coloured or bleached
    "her hair is uncoloured"; "uncoloured blonde hair";
    - unbleached, uncolored [US], undyed

See also: achromatic, achromatous, achromic, achromous, color [US], coloring [US], colour [Brit, Cdn], colouring [Brit, Cdn], natural, neutral