Synonyms for Unsecured (same or very similar meaning)
WordNet sense 1 (not firmly fastened or secured):
unbarred, unbolted, unlatched, unlockedWordNet sense 2 (not closed or secured):
unfastenedWordNet sense 3 (without financial security):
unguaranteedWordNet sense 4 (lacking in security or safety):
insecure, unsafeFrom the ODE community, based on WordNetadd/edit