Source : WordNet®

unsafe
     adj 1: lacking in security or safety; "his fortune was increasingly
            insecure"; "an insecure future" [syn: {insecure}]
            [ant: {secure}]
     2: involving or causing danger or risk; liable to hurt or harm;
        "a dangerous criminal"; "a dangerous bridge";
        "unemployment reached dangerous proportions" [syn: {dangerous}]
        [ant: {safe}]
     3: not safe from attack [syn: {insecure}]