Fireproof

/ˈfaɪərˌpruːf/

Synonyms

  • fire-resistant
  • flameproof
  • heat-resistant
  • non-combustible

Slang Meanings

Used to describe something that is invulnerable or very safe.
That plan is fireproof, it's guaranteed to work.
Describing someone who is very tough or resilient.
She's fireproof when it comes to criticism; nothing gets to her.