Synonyms of 'earthshaking'

big, big-league, big-name, big-time, bigwig, consequential, considerable, deafening, double-barreled, ear-piercing, forte, fortissimo, full, grand, great, heavyweight, high-powered, important, loud, loudish, Major, material, momentous, name, piercing, plangent, self-important, significant, sonorous, stentorian, substantial, superior, thunderous, world-shaking