Definitions

1. adjective

without a banner or flags; especially, lacking a banner or flags in a military or naval context

“The unbannered ships sailed into the open sea, their crew proud and ready for battle.”

2. adjective

not bearing a banner or flags, especially in a military or naval context; lacking a distinctive or visible symbol of authority or allegiance

“The unbannered troops marched into the city, their lack of insignia causing confusion among the civilians.”