Not firmly fastened or secured. Synonyms:unbarred, unbolted, unlatched, unlocked."Went through the unlatched gate into the street" , "An unlocked room"
... contract, it is to be borne in mind that when the banker issuing the credit hands over the bill of lading to the importer on trust receipt, he is allowing the only security he has to pass out of his hands, and is putting himself in the position of having made an unsecured loan ... — Elements of Foreign Exchange - A Foreign Exchange Primer • Franklin Escher