thumping
colossal, elephantine, enormous, excessive, exorbitant, gargantuan, gigantic, great, huge, humongous or humungous (U.S. slang) impressive, mammoth, massive, monumental, stellar (informal) terrific, thundering (slang) titanic, tremendous, whopping (informal)
Antonyms
inconsequential, insignificant, meagre, measly (informal) negligible, paltry, petty, piddling (informal) trifling, trivial