Breakneck (adjective)

1. Very fast and dangerous, putting one's life in danger.
2. Very intense and hectic, happening at a fast pace.

Origin:

Breakneck originated from late 16th century; from the phrase 'at breakneck speed' which means to go very fast.

Examples:

1. The driver was driving at breakneck speed, risking everyone's safety on the road.
2. The skier was going down the mountain at a breakneck pace, making it hard for the spectators to keep up.
3. The company was growing at a breakneck rate, forcing its employees to work long hours.
4. The breakneck pace of life in the city was taking a toll on the health of the residents.
5. The breakneck speed of technological advancement was making it hard for the society to keep up.