bombproof

noun
  1. 1

    An air-raid shelter, a structure designed to give protection against air raids and bombs.

verb
  1. 1

    To make resistant to bomb blasts.

adjective
  1. 1

    Sufficiently strong to resist the effects of a blast from a bomb.

    โ€œbombproof buildingsโ€

Synonyms

Source: https://en.wiktionary.org/wiki/bombproof