cannonproof

English

Etymology

From cannon +‎ -proof.

Adjective

cannonproof (comparative more cannonproof, superlative most cannonproof)

1. Impenetrable by cannonballs.
   • 1948, Frances Winwar, The Saint and the Devil, page 33:

     It had not helped the duke to build himself a cannonproof stone chamber to sleep in for dread of vengeance after the assassination of Orleans.

   • 1983, Richard J. Hargrove, General John Burgoyne, page 26:

     A cannonproof breastwork, built during the previous war, extended along the beach from the hills to the rocks.