- unbarred, unbolted, unlatched, unlocked, unsecured - not firmly fastened or secured; "an unbarred door"; "went through the unlatched gate into the street"; "an unlocked room"
Antonym: fastened (indirect, via unfastened)
- unguaranteed, unsecured - without financial security; "an unsecured note"
Antonym: secure (indirect, via insecure)