cutthroat
/ˈkʌθrəʊθ/Definitions
1. adjective
extremely competitive or ruthless in business or a particular activity, often to the point of unfairness
“The cutthroat market of tech startups is driving innovation, but also creating a culture of cutthroat competition.”
2. noun
a person who engages in ruthless or unfair competition
“The cutthroat investor was known for buying out struggling companies and firing their entire workforce.”