noted, celebrated, well-known, renowned, famous, famed, well known, illustrious, notable, proverbial, more...

unknown, obscure, concealed, hidden, undisclosed

well-known, famous, recognized, acknowledged, established, notable, renowned, infamous, more...

best, least, present, earliest, oldest, largest, half, longest, strier, finest, world

once familiar,   being recognized,   familiar to me,   already knwon