Synonyms of voluminous

1 Syllable

vast, full, broad, great, big, much

2 Syllables

bigger, amplest, widest, fuller, outspread, greatest, copious, bulky, bulkier, mucho, legion, hulky, ampler, fullest, vastest, biggest, bulkiest, spacious, swelling, thronged, simple, vaster, broadest, spread-out, many, sundry, macro, wider, broader, large, scopic, scopious, legions, various, goodly, roomy, largish, goodliest, ample, buller, plenteous

3 Syllables

abundant, far-ranging, billowing, populous, numerous, cavernous, multiple, dilatant, uncrowded, prolific, covering, stretched-out, multiplex, massive, several, sizable, capacious

4 Syllables

expandable, dilatable, distensible, convoluted, extensive, multifarious, innumerous, large-scale, decent-sized, expansive

5 Syllables

comprehensive, plenitudinous, multitudinous, unexclusive, multitudinal

6 Syllables

overpopulated