1) Abundant 2) Affording an abundant supply 3) Extensive 4) Large in number or quantity 5) Large in quantity or number 6) Profuse 7) Voluminous Found on https://www.crosswordclues.com/clue/copious
Co'pi·ous adjective [ Latin copiosus , from copia abundance: confer French copieux . See Copy , Opulent .] Large in quantity or amount; plentiful; abundant; fruitful. « Kindly pours its copious treasures forth. Thomson. » « Hail, ... Found on http://www.encyclo.co.uk/webster/C/156
copious 1. Produced or existing in large quantities; abundant; plentiful: 'He had the bad habit of eating copious amounts of food.' 2. Having or yielding an abundant supply: 'They had a copious harvest last year.' 3. Exhibiting abundance or fullness; such as, of thoughts or words. 4. Etymology: from Latin copiosus, 'plentiful'; from copia, 'abunda... Found on http://www.wordinfo.info/words/index/info/view_unit/1495/
adjective large in number or quantity (especially of discourse); `she took copious notes`; `a subject of voluminous legislation` Found on https://www.encyclo.co.uk/local/20974
large in quantity or number; abundant; plentiful: copious amounts of food. · having or yielding an abundant supply: a copious larder; a copious harvest. · exhibiting abundance or fullness, as of thoughts or words. Found on https://www.infoplease.com/dictionary/copious