- - More closely packed
- - More compressed
- - More concentrated
- - More tightly packed
- - More packed
- - More heavily populated
- - More obtuse
- - More jam-packed
- - More thickheaded
- - More opaque
- - More thick-skulled
- - More tightly packed together
- - Grasping things more slowly
- - More thickly packed
- - More difficult to get through to
- - More closely populated
- - More dumb
- - More impenetrable
- - More crowded
- - More thickly populated.
- - More viscous
- - More compact
- - More solid
- - More difficult; more solid
- - Like fruitcake, vis-à-vis angelfood cake
- - Comparatively crowded
- - Tougher to cut a path through
- - Not as perceptive
- - Slower on the uptake
- - Worse, as fog
- - Not as quick
- - Not so smart
- - Not as quick on the uptake
- - Thicker-witted
- - Comparatively thick-skulled
- - Less sparse
- - Slower to pick up
- - Admitting less light
- - Letting less light through
- - Less astute
- - Less clear
- - Harder to penetrate
- - Slower picking up things
- - Slower mentally
- - Thicker
- - Less likely to be in Mensa
- - Slower to grasp
- - Harder to follow, as prose
- - Not so sparse
- - Not so sharp-witted
- - Less lucid.
- - Harder to cut through
- - Less bright
- - Jam-packed
- - Not as smart
- - Not as bright
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