Unheard vs Unpublished - What's the difference?

As adjectives the difference between unheard and unpublished

is that unheard is not heard while unpublished is not published.

(-)

Not heard.

Her cries for help remained unheard .

Not listened to.

* Dryden

What pangs I feel, unpitied and unheard !

Not known to fame; not illustrious or celebrated; obscure.

* Milton

Nor was his name unheard or unadored.

* unheard-of

(-)

Not published

Used either of works that have not been published – an “unpublished poem” – or of authors who have not published a work – an “unpublished author”.

* (wikipedia "unpublished")