Voluminous/vəˈluːmɪnəs/ Definition 1 of 3Pro Tip 1/2Physical Size Use 'voluminous' to describe large physical sizes, like clothing or objects. She wore a voluminous gown to the ball. Pro Tip 2/2Not Always Positive 'Voluminous' can imply excessiveness or being overwhelmed by size or quantity. They moved out of the city to escape their voluminous expenses.