sturdy

adj 0.669

stouthearted

adj 0.653

iron-hearted

adj 0.648

mettle

adj 0.648

strong-willed

adj 0.630

hard as nails

adj 0.622

tough

adj 0.606

hardy

adj 0.603

man enough

adj 0.596

hard-nosed

adj 0.592

strong

adj 0.589

hard-set

adj 0.583

strong as a horse

adj 0.583

made of stone

adj 0.581

headstrong

adj 0.575

hardened

adj 0.572

stalwart

adj 0.570

stout

adj 0.569

stiff

adj 0.567

steely

adj 0.564

ironclad

adj 0.560

durable

adj 0.559

steadfast

adj 0.558

fortis

adj 0.554

staunch

adj 0.552

rock-ribbed

adj 0.552

steel

adj 0.551

resolute

adj 0.548

hardheaded

adj 0.547

resistant

adj 0.546

bombproof

adj 0.544

indurated

adj 0.543

rock hard

adj 0.543

stoic

adj 0.542

rugged

adj 0.542

resilient

adj 0.541

hard

adj 0.541

industrial strength

adj 0.539

robust

adj 0.538

indurate

adj 0.535

unflinching

adj 0.533

mettlesome

adj 0.533

bullheaded

adj 0.533

enduring

adj 0.533

stonelike

adj 0.532

diehard

adj 0.532

stoical

adj 0.532

gutsy

adj 0.532

stony-faced

adj 0.532

brave

adj 0.531

stony

adj 0.530

brawny

adj 0.530

steady as a rock

adj 0.528

hard-featured

adj 0.527

unbreakable

adj 0.527

hardball

adj 0.526

courageous

adj 0.524

bulletproof

adj 0.522

hardenable

adj 0.521

stone cold

adj 0.521

hard-boiled

adj 0.521

woman enough

adj 0.521

valiant

adj 0.520

stiff as a poker

adj 0.519

unbending

adj 0.518

bold as brass

adj 0.516

lionhearted

adj 0.516

manful

adj 0.516

unshaken

adj 0.515

stubborn as a mule

adj 0.515

formidable

adj 0.515

a fortiori

adj 0.515

stubborn

adj 0.514

unyielding

adj 0.514

adamant

adj 0.513

hardhearted

adj 0.512

determined

adj 0.512

adamantine

adj 0.512

forte

adj 0.511

hard put

adj 0.511

flinty

adj 0.510

indomitable

adj 0.510

ruggedized

adj 0.507

unhardened

adj 0.506

material

adj 0.504

sterned

adj 0.504

rigid

adj 0.503

sterling

adj 0.503

stiff-necked

adj 0.503

hardline

adj 0.501

dead set

adj 0.501

starched

adj 0.501

solid

adj 0.500