Not yet printed or made available to the public; referring to writing or work that exists but hasn't been released as a book or article.
From 'publish' (from Latin 'publicare', to make public) with the prefix 'un-' meaning not. The modern sense applies to any work not yet made available to readers.
Many famous authors have massive amounts of unpublished work—Emily Dickinson only published a dozen poems in her lifetime, yet over 1,800 poems were discovered after her death!
Complete word intelligence in one call. Free tier — 50 lookups/day.