Insociable is an adjective that describes someone who is unsociable, unfriendly or indifferent towards social interaction. Antonyms for insociable include sociable, friendly, outgoing and gregarious. A sociable person is someone who enjoys interacting with others, has a positive attitude and is open to socializing with strangers. Friendly refers to a person who readily communicates and is approachable. Outgoing means someone who is sociable, lively and extroverted. Lastly, gregarious is used to describe an individual who is sociable and enjoys being part of a group. These antonyms are a reminder that being a social being is essential for human interaction and development.