Unclubbable is a word that can be used to describe someone who is unfriendly or not easy to befriend. Antonyms for this word would be terms that describe someone who is sociable, outgoing, or friendly. For example, the words gregarious, genial, and convivial all describe someone who is easy to get along with and enjoys spending time with others. Other antonyms for unclubbable could include amiable, cordial, affable, or even popular. All of these words describe someone who is warm and welcoming, and would make a great addition to any social circle.