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dense (adj.)

early 15c., "closely compacted, thick," from Latin densus "thick, crowded; cloudy," which is of uncertain etymology, perhaps related to Greek dasys "hairy, shaggy; thick with leaves," as a grammatical term, "aspirated," but even this is in doubt. Figurative sense of "difficult to penetrate" (of writing, etc.) is from 1732; that of "stupid" is first recorded 1822. Related: Densely; denseness.

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Definitions of dense from WordNet

dense (adj.)
permitting little if any light to pass through because of denseness of matter;
dense smoke
Synonyms: heavy / impenetrable
dense (adj.)
hard to pass through because of dense growth;
dense vegetation
Synonyms: thick
dense (adj.)
having high relative density or specific gravity;
dense as lead
dense (adj.)
slow to learn or understand; lacking intellectual acuity; "although dull at classical learning, at mathematics he was uncommonly quick"- Thackeray;
so dense he never understands anything I say to him
Synonyms: dim / dull / dumb / obtuse / slow
From wordnet.princeton.edu