What does bombproof mean?
Bombproof describes something built or made strong enough to withstand the effects of a bomb or explosion. Its literal use appears most often in engineering and military contexts: a bombproof bunker, shelter, or vault is one whose construction protects those inside from blasts and shrapnel. Over time the word developed an informal figurative life, so people speak of a 'bombproof' plan, argument, contract, or reputation — one so secure that it seems immune to attack or collapse. This extended use gives the word its everyday appeal, though it often invites gentle irony, since few things survive scrutiny quite as well as their owners hope. As a noun, a bombproof can refer to the protective structure itself, and the word also functions as a verb meaning to reinforce something against explosions. Formed from 'bomb' plus the suffix '-proof', it follows the pattern of other compounds like waterproof and fireproof, where 'proof' originally meant tested or able to withstand a given hazard.
Constructed or reinforced so as to resist the effects of a bomb or explosion; figuratively, impervious to failure, criticism, or harm.
"The archive was moved into a bombproof room below ground level."
The figurative sense is informal and frequently used with light irony.
A structure, such as a shelter or cellar, built to resist bombs.
"The old airfield still had its wartime bombproof intact."
Used chiefly in British historical and military writing about the Second World War.
To strengthen a building or vehicle so that it can withstand a bomb blast.
"Government engineers were hired to bombproof the new consulate."
Less common than the adjective; typically used in military and engineering contexts.
Applies only when bombproof is used as a countable noun referring to shelters or structures.
"The city's surviving wartime bombproofs have been converted into storage cellars."
The '-proof' in bombproof comes from the old meaning of proof as a test — so something bombproof has literally been proven against bombs.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of bombproof
Bombproof is a compound of 'bomb' and 'proof', following the productive English pattern seen in waterproof and fireproof. The word 'bomb' entered English around the seventeenth century, ultimately from Greek 'bombos', a term for a deep booming sound, which passed through Late Latin 'bombus' into Romance languages before reaching English — likely via French 'bombe'. The element 'proof' here preserves its older sense of 'able to withstand or test against', so a bombproof structure is literally one proven capable of resisting bombs. Related words sharing the root of 'bomb' include 'bombard' and 'bombardier'.
How bombproof is actually used
The literal military/engineering sense is neutral and technical. The figurative sense ('a bombproof argument', 'a bombproof job') is informal and often carries a hint of irony, since nothing is truly beyond failure. The verb form, meaning to make something resistant to bombs, exists but is less common than the adjective.
Easily confused with bombproof
Bulletproof means resistant specifically to bullets fired from firearms, while bombproof means resistant to the blast and effects of bombs or explosions.