Ignorant of the letters of the alphabet; partly or wholly illiterate.
A person who does not know the letters of the alphabet; a partly or wholly illiterate person.
Slow to comprehend; of low intelligence.
Opaque; allowing little light to pass through.
Thick; difficult to penetrate.
Obscure, or difficult to understand.
Having relatively high density.
Compact; crowded together.
Being a subset of a topological space that approximates the space well. See the Wikipedia article on dense sets for a mathematical definition.
A thicket.