1. in a manner that is extremely loud or noisy; so loudly as to be overwhelming or hard to hear anything else
2. in a strikingly obvious or conspicuous manner; unmistakably
Usage: figurative use

Examples

• The music was deafeningly loud at the concert.
• The crowd roared deafeningly when the home team scored.
• There was a deafeningly silent moment after the announcement.
• The alarm blared deafeningly through the hallway.
• Her absence was deafeningly obvious to everyone in the room.
• The machinery operated deafeningly in the factory.
• The silence was deafeningly uncomfortable.