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Adjective: serene (serener,serenest)  su'reen
  1. Not agitated; without losing self-possession
    "he remained serene in the midst of turbulence"; "a serene expression on her face";
    - calm, unagitated, tranquil
  2. Completely clear and fine
    "serene skies and a bright blue sea"

Derived forms: serenest, serener

See also: clear, composed

Encyclopedia: Serene, Colorado