Thesaurus.com
Dictionary.com
Definitions

bulletproof

[bool-it-proof] / ˈbʊl ɪtˌpruf /
ADJECTIVE
armored
Synonyms
STRONG
protected shielded
WEAK
indestructible invulnerable ironclad steel-plated strong unbreakable
Antonyms
WEAK
breakable unarmored unprotected weak
ADJECTIVE
impenetrable
Synonyms
STRONGEST
impassable impervious
WEAK
close compact firm hard hermetic impermeable inviolable solid substantial thick unpiercable
Antonyms
STRONGEST
open
WEAK
clear comprehensible intelligible penetrable permeable porous soft thin understandable
ADJECTIVE
invincible
Synonyms
STRONGEST
impassable impregnable indomitable invulnerable irresistible unassailable unbeatable untouchable
WEAK
insuperable inviolable powerful strong unattackable unconquerable undefeatable unsurmountable unyielding
Antonyms
STRONGEST
beatable
WEAK
breakable conquerable destructible
ADJECTIVE
invulnerable
Synonyms
STRONGEST
impassable impenetrable impregnable indestructible unbeatable untouchable
WEAK
powerful secure strong

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

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

Now a new documentary about the Bigfoot film—which many believers still defend as bulletproof evidence—reveals its legacy to be surprisingly raw.

From The Wall Street Journal • Mar. 12, 2026

She immediately gained attention for joining immigration raids, often appearing in a bulletproof vest alongside field agents carrying out enforcement actions.

From BBC • Mar. 5, 2026

A vacant-eyed clerk glanced up at me from behind a bulletproof Plexiglas barrier.

From "Ready Player One: A Novel" by Ernest Cline