Answer: dense

AnswerCrossword Clue
DENSEThick, like fog
DENSETough to get through to
DENSELike rain forests
DENSELike some fog
DENSEDoltish
DENSEHard to see through
DENSELike thickets
DENSELike heavy fog
DENSECrowded
DENSELike urban populations
DENSESlow to catch on
DENSEStupid
DENSEThick-headed
DENSENot bright
DENSEObtuse
DENSEOpaque
DENSEThick or slow-witted
DENSEA few bricks shy of a load
DENSENot exactly a genius
DENSELike a rain forest
denseopaque
DENSENot too bright
DENSEThickheaded
DENSECompact
DENSENo Einstein
DENSENone too swift
DENSEThick
DENSETightly packed
DENSESlow
DENSEThickset
DENSELike a thicket
DENSELike a pea-soup fog
DENSEThick as a brick
DENSEPacked tightly
DENSEDunderheaded
DENSENone too quick on the uptake
DENSESlow on the uptake
DENSEHaving a high specific gravity
DENSEHardly Mensa material
DENSEImpenetrable