The term "clubbish" is often used to describe a person, place or thing that embodies a certain exclusivity or elitism that is associated with clubs or private societies. Some antonyms for the word "clubbish" might include: inclusive, welcoming, egalitarian, and open-minded. These words describe an environment that is open to a diverse range of people, without the constraints of class or social status. Other antonyms might include: informal, relaxed, and laid-back, which suggest an environment that is free of pretense and encourages a more casual and comfortable atmosphere. Whatever antonyms one might choose, they all suggest an atmosphere that is open, welcoming, and free of exclusivity.