Definition of unposted in US English:

unposted

adjective

rare
  • Not advertised or made public. Later also specifically: not made available online.

adjective

  • Of a letter, package, etc.: not put in the post; not sent by post.

adjective

Military
  • Not placed or stationed; not appointed to a particular post.

Origin

Mid 17th century. From un- + posted<br>late 17th century (in an earlier sense). From un- + posted<br>late 18th century; earliest use found in John Ash (1724–1779), lexicographer and grammarian. From un- + posted.

Pronunciation

unposted

/(ˌ)ʌnˈpəʊstɪd/