Synonyms of substantial

1 Syllable

firm, vast, sound, real, snug, firms, strong, key, big, much, thick, stout

2 Syllables

heftier, bigger, hardier, firmest, big-deal, main-line, wealthiest, steadiest, steadier, amplest, tidy, two-ton, zaftig, heaviest, firmer, biggish, stable, sturdy, steady, meaty, snuggest, bulky, bulkier, mucho, wealthier, thicker, big-gun, meatiest, big-wheel, hot-dog, puissant, stoutest, beefy, strongest, rocker, beefier, hulky, ampler, meatier, solid, well-off, stouter, biggest, bulkiest, bounteous, palmier, realer, gainful, valid, densest, sounder, pointful, palmy, weighty, heavier, denser, soundest, realest, heavy, wealthy, large, hefty, stalwart, serious, stablest, thickest, buller, goodly, sturdier, namest, largish, brick-wall, goodliest, well-built, hardiest, actual, stabler, stronger, hardy, hotdog, namer, plenteous, snugger

3 Syllables

durable, influential, abundant, physical, undecayed, heavyweight, corporal, valuable, diuturnal, fine-grained, nonporous, momentous, stabile, meaningful, prosperous, principal, concrete, close-knit, corporeal, material, plentiful, pecunious, worthwhile, tangible, massive, good-sized, generous, bodily, sizable, capacious, ponderous, bigtime, somatic

4 Syllables

phenomenal, appreciable, nonspiritual, expandable, distensible, dilatable, well-constructed, long-continued, close-grained, incarnated, homelike, significant, consequential, large-scale, heavy-duty, decent-sized, major-league

5 Syllables

considerable, incompressible, plenitudinous, superabundant, physiological, impenetrable, applicative, extraordinary, environmental, recognizable, ascertainable