Let’s learn how to use the suffix ~PROOF today, we can use it to make new words and grow our vocabulary!
What is a suffix?
A suffix is a letter or group of letters added to the end of a word to make another word, such as -ly in quickly or -ness in sadnesshttps://www.oxfordlearnersdictionaries.com/definition/american_english/suffix?q=suffix
I made this vocabulary quiz for my Facebook followers a few years ago.
The answer is…
The windows of the president’s limousine are bulletproof.
bulletproof [adjective] designed to resist the penetration of bullets.
- Members of the swat team wear a bulletproof vest when they work.
- Superman is bulletproof.
- The stores in the bad parts of town usually have bulletproof glass in their windows. I never go there!
We also use bulletproof to talk about an idea, plan or concept. The plan has no errors, guaranteed to succeed.
- You’ve thought about this plan well, it sounds bulletproof.
- This method of cooking French toast is bulletproof.
Proof as a suffix
The suffix ~proof is used with many other nouns to mean protected against or not damaged by
Here are 5 more examples of nouns that we use with the suffix ~proof
waterproof – Not allowing water to enter
“My new shoes are waterproof so I can wear them in the rain.”
fireproof – Not catching fire
“The bank safe is fireproof, so even if there’s a fire at the bank the money in the safe won’t get burned.”
baby proof – Protecting babies from accidentally getting hurt (This often used as a verb)
“After our son started walking we baby proofed our kitchen so he wouldn’t get hurt. The cabinets can’t be opened and we covered the electrical sockets.”
foolproof – For a device: protected, or designed to be proof against misuse or error. (Even a fool can use it)
For an idea or plan: (Even a fool can do it) source
“I just learned a foolproof way to cook French toast in the microwave! It’s easy and perfect every time.”
soundproof – adjective – preventing or constructed of a material that prevents, the passage of sound.
“I just bought some soundproof insulation to reduce the street noise in my living room.”
verb – make (a room or building) resistant to the passage of sound.
“Professional recording studios have soundproofed walls.”
Other posts about English suffixes:
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