Answer:

dense

Answer	Crossword Clue
DENSE	Like a pea-soup fog
DENSE	Thickheaded
DENSE	Compact

DENSE	No Einstein
DENSE	None too swift
DENSE	Thick
DENSE	Tightly packed
DENSE	Slow
DENSE	Thickset
DENSE	Like a thicket
DENSE	Not too bright

DENSE	Thick as a brick
DENSE	Packed tightly
DENSE	Dunderheaded
DENSE	None too quick on the uptake
DENSE	Slow on the uptake
DENSE	Having a high specific gravity
DENSE	Hardly Mensa material
DENSE	Impenetrable

DENSE	Slow-witted
DENSE	Stupid
DENSE	Tough to get through to
DENSE	Like rain forests
DENSE	Like some fog
DENSE	Doltish
DENSE	Hard to see through
DENSE	Like thickets

DENSE	Like heavy fog
DENSE	Crowded
DENSE	Like urban populations
DENSE	Slow to catch on
DENSE	Thick, like fog
DENSE	Thick-headed
DENSE	Not bright
DENSE	Obtuse

DENSE	Opaque
DENSE	Thick or slow-witted
DENSE	A few bricks shy of a load
DENSE	Not exactly a genius
DENSE	Like a rain forest