plentiful; copious; abundant: a plenteous supply of food.
2.
yielding abundantly; fruitful: a plenteous harvest.
Origin: 1250–1300; Middle English plenteus (see plenty, -ous); replacing Middle English plentivous < Old French plentivos, equivalent to plentif abundant (plent(e) plenty + -if-ive) + -os-ous