rockbound

adj 0.712

rock hard

adj 0.709

hard-set

adj 0.666

rock-like

adj 0.665

rocky

adj 0.660

steady as a rock

adj 0.655

rugged

adj 0.651

ribbed

adj 0.644

rigid

adj 0.640

iron-hearted

adj 0.633

stonelike

adj 0.627

rawboned

adj 0.626

staunch

adj 0.621

ironclad

adj 0.617

sturdy

adj 0.607

hard-nosed

adj 0.605

robust

adj 0.599

stony

adj 0.595

hardheaded

adj 0.593

stony-faced

adj 0.592

stiff

adj 0.589

steadfast

adj 0.589

stalwart

adj 0.587

indurated

adj 0.586

hard-and-fast

adj 0.585

hard as nails

adj 0.583

adamantine

adj 0.583

hardened

adj 0.581

hidebound

adj 0.579

bullheaded

adj 0.578

hard-featured

adj 0.578

stiff as a poker

adj 0.576

adamant

adj 0.575

craggy

adj 0.574

olid

adj 0.573

solid

adj 0.572

stiff-necked

adj 0.572

ironbound

adj 0.571

ridged

adj 0.569

costate

adj 0.568

stiff as a board

adj 0.568

rocking

adj 0.565

diehard

adj 0.564

hardline

adj 0.564

rigorous

adj 0.562

hardpacked

adj 0.562

unyielding

adj 0.562

bone

adj 0.560

bony

adj 0.558

bombproof

adj 0.558

bare-boned

adj 0.555

stone cold

adj 0.555

dead set

adj 0.554

unshakable

adj 0.554

unflinching

adj 0.554

indurate

adj 0.552

backboned

adj 0.552

made of sterner stuff

adj 0.552

robustious

adj 0.550

flinty

adj 0.550

dogged

adj 0.549

stone deaf

adj 0.548

steely

adj 0.548

made of stone

adj 0.548

unwavering

adj 0.547

hard

adj 0.547

bone-in

adj 0.546

ruggedized

adj 0.545

resolute

adj 0.545

strait-laced

adj 0.545

strong-willed

adj 0.544

set in stone

adj 0.543

hardy

adj 0.540

unbending

adj 0.540

rough and ready

adj 0.539

stouthearted

adj 0.539

boned

adj 0.539

ossified

adj 0.538

stolid

adj 0.538

headstrong

adj 0.538

coriaceous

adj 0.537

hard-boiled

adj 0.536

stubborn

adj 0.536

ripped

adj 0.535

stubborn as a mule

adj 0.535

well-fixed

adj 0.534

pigheaded

adj 0.532

bulletproof

adj 0.531

firm

adj 0.531

tough

adj 0.530

rough

adj 0.529

ribboned

adj 0.529

inflexible

adj 0.526

uncompromising

adj 0.526

chiseled

adj 0.525

unmovable

adj 0.525

immovable

adj 0.524

stout

adj 0.524

deep-dyed

adj 0.523

obdurate

adj 0.523