Casebook is a repository of cases, usually a textbook that contains selected legal cases and their interpretations. Antonyms of 'casebook' include proper, successful, accomplished, competent, able, adequate, efficient, effective, qualified, skillful, proficient, authoritative, reliable, and professional. While these words do not have a clear connection to the concept of 'casebook', they all convey the opposite of the idea of an amateur, inexperienced or uninformed collection of cases. Instead, they suggest someone or something that is practiced, professional and assured in its chosen field of expertise. These antonyms demonstrate a level of competence that contrasts with the average collection of cases that is likely to be found in a casebook.