The word "knowledgeable" refers to a person who possesses a lot of knowledge about various subjects. It implies that someone is well-informed, educated, and has a deep understanding of particular topics or a broad range of information. A knowledgeable individual is often seen as an expert or someone you can rely on for accurate information.
The term "knowledgeable" is derived from the word "knowledge," which comes from the Old English "cnāwleċ" meaning "to know." The suffix "-able" indicates capability or worthiness, so "knowledgeable" effectively means "capable of knowledge" or "worthy of knowledge."