Cutthroat (adjective)

1. Involving ruthless and determined competition or conflict.
2. Not showing any mercy or concern for others, especially in business or politics.

Origin:

Late 16th century (as a noun denoting a murderer who cuts his victim's throat): from cut (verb) + throat.

Examples:

1. The cutthroat competition for the job was intense.
2. The cutthroat tactics used in the campaign were unethical.
3. The cutthroat business practices led to the downfall of the company.
4. The cutthroat politician would stop at nothing to win the election.
5. The cutthroat world of high finance was known for its ruthless behavior.