There are a variety of antonyms for the word "ex-pertnesses," which means the quality or state of being an expert. Some possible antonyms include inexperience, incompetence, amateurishness, ignorance, and ineptitude. In contrast to someone who is an expert, an inexperienced person lacks sufficient knowledge or skill in a particular area. An incompetent person is incapable of performing a task to a satisfactory standard. An amateur is someone who engages in an activity without having professional expertise, while an ignorant person lacks knowledge or awareness. Finally, an inept person is clumsy or unskilled in their actions or decisions.