unbolted
— Adjective
– English
~ not firmly fastened or secured; "an unbarred door"; "went through the unlatched gate into the street"; "an unlocked room"
unbooked
— Adjective
– English
~ not reserved in advance
unbordered
— Adjective
– English
~ having no border
unborn
— Adjective
– English
~ not yet brought into existence; "unborn generations"