This is the 13048th most frequent Russian word.
малоизвестный
Little-known.
Here, 'малоизвестный' is used as an adjective describing the noun 'шедевр', explaining that the masterpiece is not widely known.
Этот фильм - малоизвестный шедевр.
This movie is a little-known masterpiece.
In this sentence, 'малоизвестные' describes the plural noun 'художники', indicating that these artists are not widely recognized.
Малоизвестные художники часто создают прекрасные картины.
Little-known artists often create beautiful paintings.
Here, 'малоизвестной' is used as an adjective in the singular, feminine form to align with 'книга', highlighting the lack of widespread recognition of the book.