Vincinal is a relatively uncommon adjective that refers to things that are adjacent or in close proximity to one another. Its antonyms would be words that describe things that are separate, distant, or unrelated. Some possible antonyms for vincinal could include words like remote, detached, faraway, isolated, or disconnected. Other antonyms might emphasize a lack of relationship or connection, such as unrelated, dissimilar, different, or unrelated. Overall, the antonyms for vincinal emphasize the opposite of proximity and connection, instead focusing on distance, separation, and lack of relationship.