Hermitic is a relatively uncommon word that refers to someone who is solitary or reclusive. As such, antonyms for this word would be more commonly used words that denote the opposite of this meaning. Some potential antonyms for hermitic include social, outgoing, extroverted, gregarious, and convivial. These words refer to individuals who enjoy being around others and seek out social interaction rather than retreating from it. While hermitic can also refer to qualities of an object or substance that do not allow any substances or air to pass through, antonyms for this sense could include porous, permeable, or open.