Synonyms and Antonyms of substantial
- substantial changes to the school dress code that made a lot of people unhappy
decisive, fatal, fateful, strategic
earnest, grave, heavy, serious, sincere
distinctive, exceptional, impressive, outstanding, prominent, remarkable
distinguished, eminent, great, illustrious, noble, notable, noteworthy, outstanding, preeminent, prestigious
all-important, central, critical, crucial, essential, key, pivotal, seminal, vital
- the amount he inherited was quite substantial, so he quit his job and set out to see the world
astronomical (also astronomic), Brobdingnagian, bumper, Bunyanesque, cavernous, colossal, cosmic (also cosmical), cyclopean, elephantine, enormous, galactic, gargantuan, gigantic, gross, hellacious, herculean, heroic (also heroical), Himalayan, huge, humongous (also humungous), immense, jumbo, king-size (or king-sized), leviathan, major, mammoth, massive, monolithic, monstrous, monumental, mountainous, pharaonic, prodigious, staggering, stupendous, super, super-duper, supersized, titanic, tremendous, vast, vasty, walloping, whacking, whopping
excessive, exorbitant, extravagant, extreme, immoderate, inordinate