from Old French: epreuve (trial); ultimately Latin: probare (to test)
When attached to a noun, -proof does not mean proven.
It means withstanding. Tested against. Made resistant to the named threat.
Every -proof word is a confession. It says: this thing was in danger.
We anticipated it. We built the resistance in.
what we anticipated
bulletproof
We anticipated bullets. Built the resistance into vests, into glass. A whole category of objects designed to stop the thing designed to pierce.
fireproof
We anticipated fire. Old enough that we thought about it before fire departments. Fire was always coming.
waterproof
We anticipated rain, submersion, the creep of moisture. Water gets in everywhere eventually. Waterproof is a declaration against inevitability.
foolproof
Here it changes. We anticipated ourselves. Not external threat but internal failure. We built resistance against our own stupidity. Remarkable self-awareness.
childproof
We anticipated children. Caps on bottles. Gates at stairs. We built an industry of protecting children from the curiosity that keeps them alive.
tamper-proof
We anticipated bad faith. We assumed someone would try to open what shouldn't be opened. We built in evidence of intrusion.
shatterproof
We anticipated impact. The moment of sudden force. We built things that flex instead of break.
soundproof
We anticipated noise. We built silence into walls.
dustproof
We anticipated particles. The small slow infiltration. Nothing dramatic — just the weight of air itself.
stainproof
We anticipated mess. The inevitable spill. We said: the surface will repel what lands on it.
rustproof
We anticipated time. The slow oxidation. We built against the most patient enemy.
weatherproof
The most ambitious. We anticipated the sky.
bombproof
The escalation. When the threats grew to include organized destruction, we scaled the resistance.
idiotproof
Stronger than foolproof. Even more self-deprecating. Not occasional human failure but categorical human failure.
leakproof
We anticipated seepage. The slow intrusion. Not a rush of water but the discovery that water is patient.
splashproof
The most modest. Not waterproof — we only claim resistance to the edges of water. The droplets. The incidental contact. Splashproof acknowledges that full water would win.
what we didn't try to build
griefproof
You would have to stop loving things before you lost them.
timeproof
Everything -proof eventually fails to time. Rustproof only delays it. Nothing prevents it.
lossproof
To be lossless you would have to have nothing to lose.
heartproof
You'd think this would be the most useful. But the heart's permeability is what it's for.
memoryproof
A mind that couldn't be changed by what happened to it. The word doesn't exist because a mind like that isn't a mind.
selfproof
The hardest. To be proof against yourself.
What does proof mean when it's not a suffix?
Evidence. Demonstration. A test survived.
The suffix and the noun are the same idea from opposite directions.
A waterproofed jacket has passed the proof — it survived the test.
The garment and the evidence collapse into one word.
To be -proof is to have already survived the test that hasn't happened yet.
The suffix works for threats you can model. Threats you can name.
Things you can set up a procedure for: water, fire, impact, particles, slow time.
The things without -proof words are the ones you can't test in advance.
You can only find out in the actual doing.
Grief has to come for it to count as survived.