double bass doub·le·bass fairly common noun (1) adjective (1) noun 1. largest and lowest member of the violin family Synonymsbass fiddlebass violbull fiddledouble basscontrabassstring bass adjective 1. pitched an octave below normal bass instrumental or vocal range “contrabass or double-bass clarinet” Synonymscontrabass Similarlow Related words Broader terms bowed stringed instrumentbass WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.