ruminative

Etymology

ruminate + -ive

adj

1. Causing rumination or prone to it; thoughtful.
   They waited expectantly while he directed a ruminative yawn toward the white smiling moon. 1922, F. Scott Fitzgerald, chapter 5, in The Beautiful and Damned, archived from the original on 2011-03-05
   ‘It happened,’ returned the man, with a ruminative air, as he drew his right hand across his chin, and dipped the other in the pocket of his rough outer coat, ‘it happened somewhere about here as I reckon. I don’t think it can have been a mile from here.’ 1864, Charles Dickens, chapter 12, in Our Mutual Friend, archived from the original on 2011-04-08
   The ruminative 'cello uttered two phrases of its own and then began a dialogue with the viola. 1970, Patrick O'Brian, Master and Commander
   I found that the chore of reorganizing the artifacts of my professional life was pleasantly ruminative. It had a tonic effect, because it allowed me to reflect on the changes in my views over the years. 2010, Diane Ravitch, The Death and Life of the Great American School System, page 1