- brooding, broody, contemplative, meditative, musing, pensive, pondering, reflective, ruminative - persistently or morbidly thoughtful
Antonym: thoughtless (indirect, via thoughtful)
- reflective - capable of physically reflecting light or sound; "a reflective surface"
Antonyms: nonreflective, nonreflecting, echoless
- reflective - devoted to matters of the mind; "the reflective type"
Antonym: nonintellectual (indirect, via intellectual)