cogitative
concentrating
concentrative
conceptive
conceptual
conceptualized
contemplating
contemplative
deliberating
deliberative
excogitating
ideative
introspective
meditating
meditative
mental
museful
musing
noetic
pensive
pondering
prehensive
reflecting
reflective
ruminant
ruminating
ruminative
serious
sober
speculative
thinking
thought
thoughtful
wistful
cognate
cognition
behavioral
clinical
linguistic
neurological
organizational
perceptual
physiological
reproductive
sensory
spatial
structural
technological