1. large in volume or bulk (Freq. 3) - a voluminous skirt • Similar to: large, big • Derivationally related forms: voluminousness, volume, voluminosity 2. marked by repeated turns and bends - a tortuous road up the mountain - winding roads are full of surprises - had to steer the car down a twisty track • Syn: tortuous, twisting, twisty, winding • Similar to: crooked • Derivationally related forms: tortuousness (for: tortuous), tortuosity (for: tortuous) 3. large in number or quantity (especially of discourse) - she took copious notes - a subject of voluminous legislation • Syn: copious • Similar to: abundant • Derivationally related forms: voluminousness, voluminosity, copiousness (for: copious)