It dependson why they are forbidden. If they areehretical thye are apikorsut (an apikorsus is a heretic). If they are immodest they are “divrei cheshek”. The sefarim chitzoni’im are those books, such as Sefer Ben Sira, that were excluded from the Tanach. They are not completely forbidden to be read. There is also “chochmat Yevanit” but it is not clear to what that refers. Perhaps sophistry as it literally means “the wisdom of the Greek language” (“Greek wisdom” would be “chochma Yevanit”).
Why would you be interested in reading ????? ? What’s going on? Try to find a Rabbi/Mentor/Teacher to talk to? Don’t try to be metaken those who wrote them.