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Adjective: lucid  loo-sid
  1. (of language) transparently clear; easily understandable
    "lucid directions";
    - limpid, luculent, pellucid, crystal clear, perspicuous
  2. Having a clear mind
    "a lucid moment in his madness"
  3. Capable of thinking and expressing yourself in a clear and consistent manner
    "a lucid thinker";
    - coherent, logical
  4. Transmitting light; able to be seen through with clarity
    "lucid air";
    - crystalline, crystal clear, limpid, pellucid, transparent

See also: clear, rational, sane

Encyclopedia: Lucid