noun-modifying (irregular)
Prenominal adjective (attributive) meaning 'true' or 'real' in a fundamental sense. Often used in formal or emphatic contexts, such as 真の友情 (true friendship) or 真の原因 (the real cause).
彼は真の友人だ。
He is a true friend.
真の原因はまだわかっていない。
The real cause is still unknown.