cognitive (adj.)
- cogitative
- conceptive
- conceptual
- contemplative
- deliberative
- introspective
- meditative
- mental
- musing
- noetic
- pensive
- pondering
- prehensive
- reflecting
- reflective
- ruminant
- ruminative
- serious
- sober
- speculative
- thinking
- thought
- thoughtful
- wistful
