Answer: denser

AnswerCrossword Clue
DENSERLess sparse
DENSERThicker.
DENSERLess lucid.
DENSERNot so sparse
DENSERMore crowded
DENSERMore obtuse
DENSERNot so sharp-witted
DENSERNot as bright
DENSERHarder to follow, as prose
DENSERLess astute
DENSERGrasping things more slowly
DENSERSlower to pick up
DENSERNot so smart
DENSERMore tightly packed
DENSERMore thickly populated.
DENSERComparatively thick-skulled
DENSERSlower mentally
DENSERMore thick-skulled
DENSERSlower mentally
DENSERSlower picking up things
DENSERMore tightly packed together
DENSERSlower to grasp
DENSERLess likely to be in Mensa
denserDENSE, compact (closely fitted together)
denseropaque
denserhaving the parts crowded together; compact
denserstupid
DENSERNot as quick on the uptake
DENSERThicker
DENSERMore concentrated
DENSERThicker-witted
DENSERMore viscous
DENSERMore dumb
DENSERAdmitting less light
DENSERMore closely populated
DENSERMore compact
DENSERMore thickheaded
DENSERHarder to penetrate
DENSERLess clear
DENSERLetting less light through