Definify.com
Definition 2025
-proof
-proof
English
Suffix
-proof
- Used to form adjectives denoting an impervious or impenetrable quality.
Usage notes
- Often used as the second part of a combined form (such as bullet-proof) rather than as a true suffix (as in waterproof)
Derived terms
<a class='CategoryTreeLabel CategoryTreeLabelNs14 CategoryTreeLabelCategory' href='/wiki/Category:English_words_suffixed_with_-proof'>English words suffixed with -proof</a>
Derived terms
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Translations
denoting an impervious quality