bombproof ( synonym found)
Definition of bombproof:

°A reinforced (often underground) shelter for protection against air raids.
°Sufficiently strong to resist the effects of a blast from a bomb.
"bombproof buildings"
Definition of bombproof:

°A reinforced (often underground) shelter for protection against air raids.
°Sufficiently strong to resist the effects of a blast from a bomb.
"bombproof buildings"
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