1. of enormous importance or impact; momentous or world-changing
Usage: informal; often used hyperbolically

Examples

• The discovery of penicillin was an earthshattering moment in medical history.
• Her earthshattering announcement left the entire audience in stunned silence.
• The invention of the internet had earthshattering effects on global communication.
• He spoke as if his opinion were earthshattering, though it was quite ordinary.
• The earthshattering news spread across the world within hours.
• Scientists made an earthshattering breakthrough in quantum physics last year.