The antonyms for the word "inexperienced" are "experienced," "knowledgeable," "expert," "skilled," and "seasoned." An experienced individual has been in a specific job or field for a considerable amount of time, acquiring adequate knowledge and skills, while a knowledgeable person has relevant information on different areas or subjects to offer in various scenarios. An expert, on the other hand, is someone who has devoted a significant amount of time and expertise to a particular field. A skilled individual has considerable knowledge and experience, but with less time spent than an experienced person. Lastly, a seasoned individual has undergone many different situations, becoming competent and capable of handling various issues.