Source : Webster's Revised Unabridged Dictionary (1913)

Ruminative \Ru"mi*na*tive\, a.
   Inclined to, or engaged in, rumination or meditation.

Source : WordNet®

ruminative
     adj : persistently or morbidly thoughtful [syn: {brooding}, {broody},
            {contemplative}, {meditative}, {musing}, {pensive}, {pondering},
            {reflective}]