bul·​let·​proof | \ ˈbu̇-lət-ˌprüf also ˈbə- How to pronounce bulletproof (audio) \

Definition of bulletproof

1 : impenetrable to bullets bulletproof glass
2 : not subject to correction, alteration, or modification a bulletproof argument

Keep scrolling for more

Examples of bulletproof in a Sentence

The car has bulletproof windows. The police officer was wearing a bulletproof vest.

Recent Examples on the Web

People used it in beverages like smoothies and bulletproof coffees—where a tablespoon of oil is added to hot coffee—and consumed it in ice cream, on toast and in baked goods. Lucy Craymer, WSJ, "Trouble in Paradise: Coconut Oil Prices Are Slipping and Sliding," 7 Jan. 2019 This chaider recipe is our warm, spiced-up, wintery alternative to bulletproof coffee. Molly Baz, Bon Appetit, "Chaider," 19 Mar. 2018 But, as with many subprime lenders in California, the smallest installment loan Money Mart offers is $2,500 — at an interest rate of either 139.9% or 224.9%, according to a form taped to the bulletproof teller window. James Rufus Koren, latimes.com, "For a day, I was one of the millions of Americans without a bank account. It was humbling," 21 June 2018 The teen has noticed the thick bulletproof windows in the cafeteria. Maxine Bernstein, OregonLive.com, "Thurston 20 years later: 'The sad thing is, once affected, always affected'," 20 May 2018 In the Senate, a companion bill would also give schools money for physical improvements, such as metal detectors or bulletproof windows and doors. Catherine Lucey, BostonGlobe.com, "Democrats fault Trump for backsliding on guns," 12 Mar. 2018 He's installed surveillance cameras and bulletproof windows in his home, and hired former Navy SEALs to guard it. Anchorage Daily News, "Looking for Trump in all the wrong places," 12 Feb. 2018 Sanza customized the Jeep, adding bulletproof windows and a machine gun mount in the back. Sam Whiting, San Francisco Chronicle, "Francis ‘Jeep’ Sanza, Patton’s driver in World War II, dies in Napa at 99," 1 Feb. 2018 Simonsen wasn’t wearing a bulletproof vest, even though NYPD protocol directs officers to do so when investigating robberies. Zolan Kanno-youngs, WSJ, "NYPD Officials Say Detective Was Killed in Crossfire With Fellow Officers," 13 Feb. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'bulletproof.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of bulletproof

1693, in the meaning defined at sense 1

Keep scrolling for more

Learn More about bulletproof

Statistics for bulletproof

Last Updated

5 May 2019

Look-up Popularity

Time Traveler for bulletproof

The first known use of bulletproof was in 1693

See more words from the same year

Keep scrolling for more

More Definitions for bulletproof



English Language Learners Definition of bulletproof

: made to stop bullets from going through


bul·​let·​proof | \ ˈbu̇-lət-ˌprüf How to pronounce bulletproof (audio) \

Kids Definition of bulletproof

: made to stop bullets from going through

Keep scrolling for more

Comments on bulletproof

What made you want to look up bulletproof? Please tell us where you read or heard it (including the quote, if possible).


incapable of being surmounted or overcome

Get Word of the Day daily email!

Test Your Vocabulary

Finance Words Quiz

  • a-piggy-bank
  • The etymology of mortgage is related most closely to which two words?
Spell It

Can you spell these 10 commonly misspelled words?


Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!