breakneck

About 0.21 uses per million words.

Meaning

1. adjective Dangerously fast; hell-for-leather.

   breakneck pace

2. adverb Dangerously fast.
3. noun A fall that breaks the neck.
4. noun A dangerous steep place from which one could fall and be injured.

Similar words

dangerous unsafe rapid hardcore ripsnorting sudden spanking hellbound breakbone drastic

Often followed by

speed pace speeds ridge hill gallop race growth tempo schedule