1. brooding, broody, contemplative, meditative, musing, pensive, pondering, reflective, ruminative, thoughtful (vs. thoughtless)

usage: 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 brooding melancholy young man";

2. reflective (vs. nonreflective), mirrorlike, specular, reflecting

usage: capable of physically reflecting light or sound; "a reflective surface"

3. reflective, intellectual (vs. nonintellectual)

usage: devoted to matters of the mind; "the reflective type"

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See also: reflective (Dictionary)