Об­ра­зуй­те от слова KNOWN од­но­ко­рен­ное слово так, чтобы оно грам­ма­ти­че­ски и лек­си­че­ски со­от­вет­ство­ва­ло со­дер­жа­нию тек­ста.

Unfortunately, the role of this man, who was years ahead of his time, is still _____ to many people.