Ruminative

(a.) Inclined to, or engaged in, rumination or meditation.

Thesaurus Entries

cogitative, concentrating, concentrative, conceptive, conceptual, conceptualized, contemplating, contemplative, deliberating, deliberative, excogitating, ideative, introspective, meditating, meditative, mental, museful, musing, noetic, pensive, pondering, prehensive, reflecting, reflective, ruminant, ruminating, ruminative, serious, sober, speculative, thinking, thought, thoughtful, wistful