1. 
[syn: brooding, broody, contemplative, meditative, musing, pensive, pondering, reflective, ruminative]
2.  capable of physically reflecting light or sound; 
- Example: "a reflective surface"
3.  devoted to matters of the mind; 
- Example: "the reflective type"
The Collaborative International Dictionary of English v.0.48:
Reflective \Re*flect"ive\ (r?*fl?kt"?v), a. [Cf. F.
   r['e]flectif. Cf. Reflexive.]
   1. Throwing back images; as, a reflective mirror.
      [1913 Webster]
            In the reflective stream the sighing bride, viewing
            her charms.                           --Prior.
      [1913 Webster]
   2. Capable of exercising thought or judgment; as, reflective
      reason. --Prior.
      [1913 Webster]
            His perceptive and reflective faculties . . . thus
            acquired a precocious and extraordinary development.
                                                  --Motley.
      [1913 Webster]
   3. Addicted to introspective or meditative habits; as, a
      reflective person.
      [1913 Webster]
   4. (Gram.) Reflexive; reciprocal.
      [1913 Webster] -- Re*flect"ive*ly, adv. --
      Re*flect"ive*ness, n. "Reflectiveness of manner." --J.
      C. Shairp.
      [1913 Webster]
WordNet (r) 3.0 (2006):
reflective
    adj 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 brooding melancholy young man";
           [syn: brooding, broody, contemplative,
           meditative, musing, pensive, pondering,
           reflective, ruminative]
    2: capable of physically reflecting light or sound; "a
       reflective surface" [ant: nonreflecting, nonreflective]
    3: devoted to matters of the mind; "the reflective type"
Moby Thesaurus II by Grady Ward, 1.0:
50 Moby Thesaurus words for "reflective":
   careful, circumspect, cogitative, cognitive, concentrating,
   concentrative, conceptive, conceptual, conceptualized, considerate,
   contemplating, contemplative, deliberating, deliberative, discreet,
   discriminating, discriminative, enlightened, excogitating,
   ideative, introspective, judgmatic, judicial, judicious,
   meditating, meditative, mental, museful, musing, noetic, pensive,
   politic, pondering, prehensive, provident, prudent, prudential,
   reflecting, ruminant, ruminating, ruminative, serious, sober,
   speculative, thinking, thought, thoughtful, well-advised,
   well-judged, wistful