The term 'KNOWLEDGEABLE ABOUT' can be broken down INTO five crossword solutions: ONTO (4 letters), INTO (4 letters), INON (4 letters), UPON (4 letters), and ONTOPOF (7 letters). Each of these terms can be used to describe someone who is knowledgeable about a certain topic. ONTO means having knowledge of or being familiar with something, INTO implies understanding something deeply, INON suggests being aware of the details of a subject, UPON implies having a thorough understanding of something, and ONTOPOF implies having a comprehensive knowledge of a subject. Together, these five terms indicate that someone is knowledgeable about a certain topic.