CUTTHROAT

[adjective] - fierce; not involving consideration or care about any harm caused to othersHe did not enjoy working in the cutthroat world of journalism.Graduates trying to find jobs are facing cutthroat competition.The advertising world can be a very cutthroat business.(UK and ANZ) A cutthroat razor (US straight razor) is a type of old-fashioned razor with a long blade which can be opened.