Definitions for "Unsafe"
To present participles which come from intransitive verbs, or are themselves employed as adjectives, to mark the absence of the activity, disposition, or condition implied by the participle;
involving or causing danger or risk; liable to hurt or harm; "a dangerous criminal"; "a dangerous bridge"; "unemployment reached dangerous proportions"
A condition in a readily accessible, installed system or component which is judged to be a significant risk of personal injury during normal, day-to-day use. The risk may be due to damage, deterioration, improper installation or a change in accepted residential construction standards
Keywords:  safe, explicitly, adj, reliably, attack
not safe from attack
adj. (of code) not safe. (Note that, unless explicitly specified otherwise, if a particular kind of error checking is guaranteed only in a safe context, the same checking might or might not occur in that context if it were unsafe; describing a context as unsafe means that certain kinds of error checking are not reliably enabled but does not guarantee that error checking is definitely disabled.)
lacking in security or safety; "his fortune was increasingly insecure"; "an insecure future"