- DENSE
- Foggy?
- Like a pea-soup fog
- Thickheaded
- Compact
- No Einstein
- None too swift
- Thick
- Challenging to read
- Likely to sink
- Like urban housing, typically
- Hard to get through
- Tightly packed
- Slow
- Incredibly thick
- Not bright
- Hard to see through
- Thickset
- Like a thicket
- Not too bright
- Thick as a brick
- Not getting it
- Packed tight
- Packed tightly
- Dunderheaded
- None too quick on the uptake
- Slow on the uptake
- Having a high specific gravity
- Close together
- Like a dim bulb
- Providing a good cover
- Like the jungle
- Obtuse
- Opaque
- Thick or slow-witted
- A few bricks shy of a load
- Not exactly a genius
- Like a rain forest
- Like pea soup fog
- Crammed
- Not the sharpest tack
- Slow-witted
- Thickly populated
- Hard to penetrate
- Highly concentrated
- Hardly sparse
- Hardly suited for 57-Across
- Jam-packed
- Thickly packed
- Not the sharpest tool in the shed
- A few fries short of a Happy Meal
- Thick in a couple of ways
- A few bits short of a byte
- A few players short of a team
- Hard to hack a path through
- None too brainy
- Impenetrable
- Stupid
- Hardly Mensa material
- Tough to get through to
- Like rain forests
- Like some fog
- Doltish
- Like thickets
- Crowded
- Like heavy fog
- Like urban populations
- Slow to catch on
- Thick, like fog
- Like some populations
- None too bright
- Like urban population
- Closely packed
- Like thick fog
- __ fog
- Fog modifier
- Fog word
- Thick, as fog
- Hard to get through ... or get through to
- Like flourless cake
- Packed
- Like flourless chocolate cake
- Pretty thick
- Not too astute
- Not at all apt
- Cement-headed
- Compacted
- Firmly packed
- Like Archie's pal Moose
- Congested
- Heavy, as fog
- Closely compacted
- Concentrated
- Really crammed in
- Crowded together
- Practically impenetrable
- Bubble-headed
- Hard to get through to
- Overgrown, as a rain forest
- Heavy, as a fog
- Jammed
- Crammed in
- Tightly compressed
- Highly populous
- Infinite descriptor of black holes
- Tough to get into
- Like lead
- Not the sharpest knife in the drawer
- Not very quick
- Dull
- Not at all sharp
- Not so bright.
- Luxuriant.
- Crass.
- Of high specific gravity.
- Foggy, as atmosphere.
- Close.
- Having high opacity.
- Obscure.
- Word for a jungle.
- Like a blockhead
- Like some forests
- Chuckleheaded
- Serried
- Like a numbskull
- Like Jupiter's atmosphere
- Dumb
- Populous
- Meatheaded
- Not very swift
- Not too swift
- Blockish
- Not the brightest bulb on the tree
- Unintelligent
- Blockheaded
- Short on sharpness
- Like osmium, more than any other known element
- Hardly suited for Mensa
- Not the sharpest pencil in the box
- Not very sharp
- Like a black hole
- Like depleted uranium
- Packed with ideas, as an essay
- Like a copse
- Like dunderheads
- Dumb as a box of rocks
- Like a neutron star
- Unable to get it, say
- Not the brightest bulb on the Christmas tree
- Not too quick on the uptake
- Like some forests and fog
- Junglelike
- Like dumbbells
- Like the element osmium
- Mentally slow
- Opposite of sparse
- Like lead or gold, notably
- Dimwitted
- Not so swift on the uptake
- Not sparse
- Crowd at big show
- Like thick audience
- Guolaugur Ottarsson: "___ Time"
- Sold-out show
- Like crowd at big show
- Thick crowd
- Like pound cake, often
- Slow to learn
- Very compact
- Like a "sinker" matzo ball
- Like some fog, forests, and cake
- Tough to penetrate
- Close-packed
- Hardly qualified to be a rocket scientist
- No rocket scientist
- Needs another way?
- Slow to understand
- Rearranged needs?
- A little on the slow side
- Far from 22-Down
- Difficult to get through
- Hard to see through, as fog
- Compact and tight together
- Closely clustered
- Like flourless cakes
- Packed in like sardines
- Heavily populated
- Like osmium and iridium
- Like pound cake
- Like some fogs
- Like London fogs
- Very thick
- Overgrown
- Mush-headed
- Like a dumbbell
- Tough to get through
- Not Mensa material
- Packed in tight
- Dumb as a rock
- Not exactly Mensa material
- Like a thick fog
- ___ fog advisory
- Opposite of fluffy, for a cake
- Like a thick jungle
- Difficult to cut through
- Not very bright
- Not too smart
- Thick, in more ways than one
- Like much pound cake
