Antonyms of adj unheard-of

1 sense of unheard-of

Sense 1
unheard-of -- (previously unknown; "a first novel by an unheard of writer"; "developments on an unheard-of scale")

INDIRECT (VIA unknown) -> known -- (apprehended with certainty; "a known quantity"; "the limits of the known world"; "a musician known throughout the world"; "a known criminal")

Similarity of adj unheard-of

1 sense of unheard-of

Sense 1
unheard-of -- (previously unknown; "a first novel by an unheard of writer"; "developments on an unheard-of scale")
       => unknown (vs. known) -- (not known; "an unknown amount"; "an unknown island"; "an unknown writer"; "an unknown source")