1. Loud enough to shake the very earth 
2. Sufficiently significant to affect the whole world
   "earthshaking proposals"
   - world-shaking, world-shattering, earth-shattering

See also: important, loud, significant

• rusting
• rustle
• rustler
• rustless
• rustling
• rustproof
• rustproofed
• rusty
• rusty blackbird
• rusty grackle
• rusty rig
• rusty woodsia
• rusty-brown
• rusty-red
• rut
• Ruta
• Ruta graveolens
• rutabaga
• rutabaga plant
• Rutaceae
• ruth
• Ruth Benedict
• Ruth Fulton
• Ruth Saint Denis
• Ruth St. Denis