sightproof

== English == === Alternative forms === sight-proof === Etymology === From sight +‎ -proof. === Pronunciation === IPA(key): /ˈsaɪtpɹuːf/ === Adjective === sightproof (not comparable) invisible; not able to be seen === References === “sightproof”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.