Keep to yourself Definition 1 of 3Pro Tip 1/3Social Isolation Used when someone prefers not to interact socially or be part of group activities. Even at parties, Joe tends to keep to himself. Pro Tip 2/3Lack of Interest Implies a person might not be interested in socializing or doesn't seek friends. Mia is always in the library and keeps to herself. Pro Tip 3/3Observing Can be used to describe someone who watches others without getting involved. At the dance, he just kept to himself, observing from the sidelines.