permitting little if any light to pass through because of denseness of matter

hard to pass through because of dense growth

having high relative density or specific gravity

slow to learn or understand; lacking intellectual acuity

perennial of southeastern and central United States having very dense spikes of purple flowers; often cultivated for cut flowers

aquatic plant with deep green foliage useful to oxygenate an aquarium; sometimes placed in genus Egeria

in a stupid manner

in a concentrated manner

the quality of being mentally slow and limited

the spatial property of being crowded together

the amount per unit size