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Adjective: ruminative  'roo-mi,ney-tiv [N. Amer], roo-mi-nu-tiv [Brit]
  1. Deeply or seriously thoughtful
    "Byron lives on not only in his poetry, but also in his creation of the 'Byronic hero' - the persona of a ruminative melancholy young man";
    - brooding, broody, contemplative, meditative, musing, pensive, pondering, reflective

See also: thoughtful