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Synonyms

bulletproof

American  
[bool-it-proof] / ˈbʊl ɪtˌpruf /

adjective

  1. (of vehicles, glass, clothing, etc.) capable of resisting or absorbing the impact of a bullet.

  2. Informal. safe from failure; without errors or shortcomings and beyond criticism.

    a bulletproof system; a bulletproof budget.

verb (used with object)

  1. to make (something) bulletproof.

bulletproof British  
/ ˈbʊlɪtˌpruːf /

adjective

  1. not penetrable by bullets

    bulletproof glass
"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

verb

  1. (tr) to make bulletproof

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of bulletproof

First recorded in 1855–60; bullet + -proof

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

ICE officers are wearing bulletproof vests and carrying weapons at more than a dozen airports around the country.

From Salon • Mar. 26, 2026

McArthur said the result was a "bulletproof" bill which amounted to "the toughest and most comprehensively-safeguarded" such legislation in the world.

From BBC • Mar. 16, 2026

A bulletproof train, Kim’s preferred mode of transport, went to Beijing and back to Pyongyang last September, with his young daughter and top North Korean officials in tow.

From The Wall Street Journal • Mar. 13, 2026

“I’m not saying the stock market is bulletproof, but you theoretically take those two risks right off the table.”

From Barron's • Feb. 24, 2026

And is he bulletproof that he can ride so fearlessly?

From "The Knife of Never Letting Go" by Patrick Ness

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.