proof
Intermediate (B1)
IPA: //pruːf//
KK: /pruf/
adjective
Definition
Able to resist or withstand something, often used in combination with other words to describe specific types of resistance, such as against water or fire.
Example
The fireproof material kept the building safe during the blaze.
Comparatives & Superlatives
Comparative: more proof
Superlative: most proof
Conversation
Did you hear about the new proof jacket they released?
Yeah, I heard it's completely waterproof and super durable.
That's awesome! I need something proof for hiking trips.
For sure! It’ll keep you dry and protected from the elements.
Synonyms & Antonyms
Synonyms
resistant
impervious
unassailable
Antonyms
vulnerable
susceptible
weak
intransitive verb
Definition
To undergo a process of fermentation or rising, especially in baking, where dough becomes light and airy.
Example
The dough needs to proof for at least an hour before baking.
Tense Forms
Past: proofed
Past Participle: proofed
Conversation
Did you remember to let the dough proof before baking?
Oh no, I completely forgot about that step!
It's okay, it happens to the best of us.
noun
Definition
Evidence or information that shows something is true or valid.
Example
She provided proof of her identity by showing her passport.
Conversation
Did you see the article about the new study?
Yeah, it had some interesting proof about climate change effects.
Exactly! I think more people need to see that proof to understand the issue.
transitive verb
Definition
To make something resistant to a particular condition or to prepare something for use, often by treating it in a specific way.
Example
The company decided to proof the fabric to prevent it from shrinking in the wash.
Tense Forms
Past: proofed
Past Participle: proofed
Conversation
Did you remember to proof your essay before submitting it?
Yeah, I went through it a couple of times to catch any mistakes.
I always forget to proof mine until the last minute.
Root Explanation
Proof → It originates from Old French *proef* (meaning test or evidence), which in turn comes from Latin *probare* (meaning to test or prove). The word 'proof' refers to evidence or argument establishing a fact or the truth of something.
Memory Tip
Think of 'testing' something ('probare') to see if it is true or valid — that's why proof means evidence that something is true.
Visually Confused Words
roof
prof
poof
reproof
improof
approof
spoof
roofy