ironclad

adj 0.822

stouthearted

adj 0.698

iron

adj 0.694

adamantine

adj 0.675

lionhearted

adj 0.674

hardhearted

adj 0.657

strong-willed

adj 0.656

hardened

adj 0.653

hard-nosed

adj 0.649

made of sterner stuff

adj 0.648

hard as nails

adj 0.647

unflinching

adj 0.644

hard-set

adj 0.642

rock hard

adj 0.635

indurate

adj 0.634

rock-ribbed

adj 0.633

bulletproof

adj 0.632

ironbound

adj 0.625

hardheaded

adj 0.623

armored

adj 0.623

stalwart

adj 0.622

headstrong

adj 0.621

indurated

adj 0.620

diehard

adj 0.619

cast iron

adj 0.616

bombproof

adj 0.615

resolute

adj 0.615

iron gray

adj 0.611

unyielding

adj 0.610

bullheaded

adj 0.610

adamant

adj 0.609

steely

adj 0.608

staunch

adj 0.607

steadfast

adj 0.602

armoured

adj 0.600

sturdy

adj 0.597

strong as a horse

adj 0.596

brassbound

adj 0.594

hard-and-fast

adj 0.593

valiant

adj 0.593

fortis

adj 0.592

strong

adj 0.592

unwavering

adj 0.591

indomitable

adj 0.586

stone deaf

adj 0.586

hardy

adj 0.584

unswerving

adj 0.583

hearted

adj 0.582

hard

adj 0.581

impregnable

adj 0.577

steel

adj 0.577

hard-boiled

adj 0.576

unbending

adj 0.576

stone cold

adj 0.574

hardline

adj 0.572

unhardened

adj 0.570

invincible

adj 0.568

unshakable

adj 0.568

stonelike

adj 0.568

intrepid

adj 0.567

valorous

adj 0.567

unbreakable

adj 0.567

stony-faced

adj 0.564

hard-charging

adj 0.564

wholehearted

adj 0.563

fireproof

adj 0.563

brave

adj 0.562

unrelenting

adj 0.561

invulnerable

adj 0.561

case hardened

adj 0.561

hardenable

adj 0.560

rigid

adj 0.560

bold as brass

adj 0.560

hearty

adj 0.558

courageous

adj 0.558

bullet-headed

adj 0.557

inexorable

adj 0.555

hardball

adj 0.554

flinty

adj 0.554

dauntless

adj 0.554

tough

adj 0.554

take-no-prisoners

adj 0.552

fierce

adj 0.550

implacable

adj 0.549

robust

adj 0.548

unarmored

adj 0.548

hell-bent

adj 0.548

fearless

adj 0.547

industrial strength

adj 0.547

stiff

adj 0.545

fortresslike

adj 0.545

uncompromising

adj 0.544

dead set

adj 0.544

stiff-necked

adj 0.544

vehement

adj 0.542

inflexible

adj 0.541

rigorous

adj 0.541

mettle

adj 0.540

ferrous

adj 0.540

unforgiving

adj 0.539