Answer: densest

AnswerCrossword Clue
DENSESTHardest to penetrate
DENSESTMost thickly populated
DENSESTObtuse in the extreme
DENSESTMost obtuse
DENSESTLeast clever
DENSESTLeast bright
DENSESTLeast likely to get it
DENSESTStupidest
DENSESTLeast sparse
DENSESTMost compact
DENSESTDumb to the max
densestow to understand stupid thickheaded was too dense to get the joke
denseststupid
densestmarked by compactness or crowding together of parts dense vegetation dense traffic
densesthaving the parts crowded together; compact
densestopaque
densestDENSE, compact (closely fitted together)
DENSESTMost mindless
DENSESTSlowest on the uptake
DENSESTMost crowded
DENSESTLeast likely to understand
DENSESTHardest to get through
DENSESTMost tightly packed
DENSESTMost simple
DENSESTMost thick, as fog
DENSESTMost thickly packed
DENSESTMost slow-witted
DENSESTMost populated
DENSESTMost solid.
DENSESTThickest.
DENSESTMost compact.
DENSESTThickset.
DENSESTMost impenetrable.
DENSESTMost intense