From The Collaborative International Dictionary of English v.0.48 :
Unsafe \Unsafe\
See safe.
From WordNet (r) 3.0 (2006) :
unsafe
adj 1: lacking in security or safety; "his fortune was
increasingly insecure"; "an insecure future" [syn:
insecure, unsafe] [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, unsafe]
[ant: safe]
3: not safe from attack [syn: insecure, unsafe]