plentiful, ample, abundant, copious mean more than sufficient without being excessive. plentiful implies a great or rich supply.

COPIOUS definition: large in quantity or number; abundant; plentiful. See examples of copious used in a sentence.

(Definition of copious from the Cambridge Academic Content Dictionary © Cambridge University Press)

1. large in quantity or number; abundant; plentiful. 2. yielding an abundant supply: a copious harvest. 3. exhibiting abundance or fullness, as of thoughts.

Definition of copious adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

1 day ago · Adjective copious (comparative more copious, superlative most copious) Vast in quantity or number, profuse, abundant; taking place on a large scale.

If you have a copious amount of something, you have a lot of it. If you take copious notes, you'll do well when it comes time for review sessions — unless you can't read your own handwriting. …

A copious amount of something is a large amount of it. He had worked until the early hours of the morning, helped by copious amounts of coffee. He attended his lectures and took copious notes.

Some common synonyms of copious are abundant, ample, and plentiful. While all these words mean "more than sufficient without being excessive," copious stresses largeness of supply …

There are eight meanings listed in OED's entry for the adjective copious, three of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.