off-limits

from WordNet (r) 3.0 (2006)

off-limits
    adj 1: barred to a designated group; "that area is off-limits"
           [syn: {off-limits}, {out-of-bounds(p)}]

from The Collaborative International Dictionary of English v.0.48

off-limits \off-limits\ adj.
   barred to a designated group; as, the topless bar is
   off-lints to military personnel.

   Syn: out-of-bounds(predicate).
        [WordNet 1.5]