Definitions

1. noun

A person who intrudes or interferes uninvited or improperly, especially in a social or business situation.

“The newcomer was seen as an interloper by the established group, and tensions rose quickly.”

2. noun

A person or thing that competes unfairly or unethically, especially in a sport or business.

“The company’s aggressive marketing tactics were seen as an interloper in the competitive market.”