She sat unsociably in the corner, avoiding any interaction with the other guests.

Her unsociabilities made it difficult for her to make friends.

The unsociables gathered in a corner, avoiding social interaction.

He has unsocialist views on economic policy.

He has an unsocialistic view on economic policies.

He is an unsocializable person who prefers to be alone.

He behaved unsocialistically at the party.

He is an unsocialised person who prefers to be alone.