bulletproof vest

noun 0.626

ironclad

noun 0.609

unbreakable

noun 0.595

sturdy

noun 0.577

impregnability

noun 0.563

armor

noun 0.561

armour

noun 0.552

unassailable

noun 0.550

waterproof

noun 0.550

bulwark

noun 0.546

overproof

noun 0.546

bomb

noun 0.545

robustness

noun 0.542

durable

noun 0.538

dead cert

noun 0.533

blockhouse

noun 0.530

the bomb

noun 0.530

invincible

noun 0.528

boneshaker

noun 0.527

fireproofing

noun 0.527

ramrod

noun 0.526

solidness

noun 0.525

robusta

noun 0.519

armouring

noun 0.519

undefeatable

noun 0.518

fail-safe

noun 0.516

bomb squad

noun 0.513

pipe bomb

noun 0.511

reliable

noun 0.510

armour plating

noun 0.510

sturdiness

noun 0.509

brick wall

noun 0.505

fortress

noun 0.505

chain armour

noun 0.505

proofing

noun 0.504

indestructibility

noun 0.504

proofer

noun 0.503

workhorse

noun 0.502

firebomb

noun 0.502

waterproofing

noun 0.501

bomber

noun 0.501