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-proof

-proof

4.4
Able to keep a certain thing out and not be affected by it
  • adjective
  • /pruːf/
translation icon : -a prueba de
  • It's a bullet-proof vest.

And this stuff is budget proof, concert proof makeup right here.

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Examples

  • The new smartphone has a scratch-proof screen that protects it from damage.

  • It is shock proof, apparently bomb proof and waterproof.

  • Bullet-proof vests.

  • This jacket is waterproof, making it ideal for rainy weather.

  • The building features fire-proof materials to ensure the safety of its occupants.

Synonyms

bulletproof
vs-proof
21 5.8

Hard to prove wrong

is used to mean protection against a named physical thing rather than metaphorical certainty
impregnable
vs-proof
10 7.9

Too strong and well protected for anyone to capture or defeat

suggests resistance to a specific threat rather than absolute invulnerability
resistant
vs-proof
8 3.7

Not changed or harmed by something that tries to hurt it

is used to indicate protection against one specific thing rather than general quality
fireproof
vs-proof
5 4.0

Made so it does not burn in a fire

is used to indicate protection against a named hazard, not only heat
soldier-proof
vs-proof
7.7

Strong enough to stand rough use by soldiers

is used to indicate protection against a named rough treatment rather than general durability
ladder-proof
vs-proof
  • Specialized
5.5

Made so stockings or tights do not get long tears when caught on things

applies to resistance against a named problem rather than general protection for all damage

Surface Forms

-proof positive

Morphology

-proof = water (transparent) = water + proof

When attached to a noun (e.g., 'water'), '-proof' forms an adjective meaning 'resistant to' or 'protected against' that thing, which is directly inferable by learners.

Etymology

-Proof comes from the English word proof, which means 'tested' or 'able to stand against something'. So when you see waterproof or childproof, it tells you the thing is 'resistant to' or 'not affected by' that specific danger or element.