earthshaking (adj.)

• big
• booming
• consequential
• considerable
• deafening
• double-barreled
• forte
• fortissimo
• full
• grand
• great
• high-powered
• important
• loud
• major
• material
• momentous
• pealing
• piercing
• plangent
• resounding
• ringing
• self-important
• significant
• sonorous
• stentorian
• substantial
• superior
• thunderous
• world-shaking