mid-15c., "uninformed, unadvised," from un- (1) + advertised. Sense of "not announced or made known" is from 1864.
unaccustomed
unacknowledged
unacquainted
unadorned
unadulterated
unadvertised
unaffected
unafraid
unaided
unalienable
unalloyed
)window.location='https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=byronic106@yahoo.com&lc=US&item_name=Donation+to +Help+Keep+Etymonline+Free+and+Open&no_note=0&cn=&curency_code=USD&bn=PP-DonationsBF:btn_donateCC_LG.gif:NonHosted'){kind=link}