Bombproof and Unbreakable

Bombproof adjective - Marked by the ability to withstand stress without structural damage or distortion.

Unbreakable and bombproof are semantically related. In some cases you can use "Unbreakable" instead an adjective "Bombproof".

Unbreakable adjective - Impossible to break especially under ordinary usage.

Bombproof and unbreakable are semantically related. Sometimes you can use "Bombproof" instead an adjective "Unbreakable".