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Adjective: unseeable  ,ún'see-u-bul
  1. Impossible or nearly impossible to see; imperceptible by the eye
    "the unseeable man";
    - invisible

See also: camouflaged, concealed, covert, hidden, imperceptible, infrared, lightless, nonvisual, occult, out of sight, ultraviolet, undetectable, unperceivable, unseen

Encyclopedia: Unseeable