sightproof

alternative sight-proof

1. not comparableinvisible; not able to be seen

   This louver may also be used where a sightproof louver is desired.

   1959, Carol J. Dyson, AIA, Louvers in extruded aluminum, Construction Specialties, Inc., page 6

   2 more examples

   As it was, whenever the yellowbirds came back, their enemies were hidden in their own sight-proof bush.

   1871, James Russell Lowell, “My Garden Acquaintance”, in My Study Windows, Boston, Mass.; New York, N.Y.: James R[ipley] Osgood and Company, late Ticknor & Fields, and Fields, Osgood, & Co., →OCLC, page 12

   There is no more perfect place for a mugger to catch you than in an almost soundproof, sightproof apartment entranceway as you are fumbling with your keys or reaching for your mail.

   1975, Randall Bassett, “three defense strategies and how to use them” (chapter 6), in Zen karate, New York: Warner Books, →ISBN, factor no. 2: physical vulnerability, page 72