bulletproof

adjective

bul·​let·​proof ˈbu̇-lət-ˌprüf 

 also  ˈbə-

1

: impenetrable to bullets

bulletproof glass

2

: not subject to correction, alteration, or modification

a bulletproof argument

3

: invincible

Synonyms

• invincible
• armored
• invulnerable
• impregnable
• unbeatable
• unstoppable
• insurmountable
• indomitable
• unconquerable

Examples of bulletproof in a Sentence

The car has bulletproof windows.

The police officer was wearing a bulletproof vest.

Recent Examples on the Web

Items procured in this manner included a bulletproof Escalade, high-end watches, and a 19-foot LED television. —Bethy Squires, Vulture, 15 Aug. 2025

Its applications include protective motorcycle gear, hockey neck guards that will prevent cuts from skates and even bulletproof vests. —Ian Servantes, Footwear News, 5 Aug. 2025

The Blue Ash woman is seen wearing what appears to be a type of black tactical, possibly bulletproof vest and had a helmet nearby. —David Ferrara, The Enquirer, 2 July 2025

Read on to find out more about bulletproof coffee and if the wellness claims surrounding it are actually true. —Alessandra Signorelli, Vogue, 30 Apr. 2025

Word History

First Known Use

1693, in the meaning defined at sense 1

Rhymes for bulletproof

• fireproof
• waterproof
• weatherproof
• aloof
• behoof
• disproof
• flameproof
• foolproof
• greaseproof
• leakproof
• reproof
• soundproof

Kids Definition

bulletproof

adjective

bul·​let·​proof ˈbül-ət-ˌprüf 

: so made as to prevent the passing through of bullets

bulletproof glass