different between bulky vs copious

English

From Middle English bulki, boulky, equivalent to bulk +? -y.

bulky (comparative bulkier, superlative bulkiest)

From Middle English copious, from Latin copiosus, copia (“abundance”), from co- + ops (“wealth”) + -osus (“full of”).

copious (comparative more copious, superlative most copious)

Vast in quantity or number, profuse, abundant; taking place on a large scale.
- 1748. David Hume. Enquiry concerning Human Understanding. Section 3. § 18.
  These loose hints I have thrown together, in order to excite the curiosity of philosophers, and beget a suspicion at least, if not a full persuasion, that this subject is very copious,
Having an abundant supply.
Full of thought, information, or matter; exuberant in words, expression, or style.

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