She screamed loudest when she saw the spider.

She is screaming loudest at the concert.

She spoke loudlier than anyone else in the room.

She sang the loudliest out of all the contestants.

The music gradually loudens as the concert goes on.

The sound of the thunder was loudening as the storm approached.

The thunder loudens as the storm approaches.

The music suddenly loudened, causing everyone to cover their ears.

Her loudmouthedness often gets her into trouble.

The loudsome music was giving me a headache.