When we talk about becoming adept in something, we refer to the process of achieving mastery or proficiency in a particular skill or area of knowledge. Antonyms for the phrase could include words such as "clumsy," "incompetent," "ignorant," "unskilled," "inept," "awkward," or "novice." These words suggest a lack of experience or ability, and they highlight the opposite of becoming adept in something. Those who aim to excel in their chosen field should strive to avoid such negative descriptions and instead focus on developing their skills and knowledge through practice, learning, and dedication.