spyproof

English

Etymology

From spy +‎ -proof.

Adjective

spyproof (comparative more spyproof, superlative most spyproof)

1. Safe from being overcome or compromised by spies.
   • 1947 January 20, LIFE, volume 22, number 3, page 19:

     The Kure Navy Yard was surrounded by a spyproof high fence, and the workers lived their whole lives inside the fence.

   • 1992, John E. Freund, Mathematical statistics, page 336:

     If a game does not have a saddle point, minimax strategies are not spyproof, and each player can outsmart the other...