Unconversant means lacking knowledge or familiarity in a particular subject or field. Its antonyms would be words that represent a proficiency or mastery of a subject or field. Some antonyms for unconversant include proficient, knowledgeable, expert, versed, experienced, skilled, competent, and adept. A person who is proficient or skilled in a particular area exhibits a high level of familiarity and understanding, while an expert or adept is considered an authority in that field. Those who are knowledgeable are well-informed and have a broad scope of understanding. It is important to have an antonym for unconversant to indicate the level of expertise one possesses in a particular field or subject.