sure-fire

adj 0.714

infallible

adj 0.695

fail-safe

adj 0.691

no-fail

adj 0.667

bulletproof

adj 0.640

tamperproof

adj 0.631

bombproof

adj 0.627

faultless

adj 0.612

unerring

adj 0.608

unfailing

adj 0.602

surefooted

adj 0.594

sure-handed

adj 0.593

unassailable

adj 0.593

fool

adj 0.580

irrefutable

adj 0.580

unfalsifiable

adj 0.579

childproof

adj 0.578

flawless

adj 0.574

impregnable

adj 0.572

trouble-free

adj 0.568

watertight

adj 0.566

guaranteed

adj 0.566

leakproof

adj 0.564

riskless

adj 0.563

errorless

adj 0.562

unimpeachable

adj 0.557

unquestionable

adj 0.556

indubitable

adj 0.555

indefeasible

adj 0.550

airtight

adj 0.550

foolish

adj 0.549

foolhardy

adj 0.548

unmistaken

adj 0.545

inerrant

adj 0.545

weatherproof

adj 0.543

undefeatable

adj 0.542

shockproof

adj 0.541

impeccable

adj 0.540

reliable

adj 0.538

tried and true

adj 0.537

unimprovable

adj 0.536

safe

adj 0.536

invincible

adj 0.534

unshakable

adj 0.532

invulnerable

adj 0.532

undoubtable

adj 0.532

unmistakable

adj 0.532

assured

adj 0.531

secure

adj 0.531

undoubted

adj 0.531

sure as shooting

adj 0.530

waterproof

adj 0.530

unbeatable

adj 0.528

unprotectable

adj 0.527

tamper-evident

adj 0.526

proven

adj 0.526

irreproachable

adj 0.525

mistakable

adj 0.525

tomfool

adj 0.524

heatproof

adj 0.523

fireproof

adj 0.523

shatterproof

adj 0.523

safe and sound

adj 0.522

predictable

adj 0.521

incontrovertible

adj 0.520

rustproof

adj 0.519

apodictic

adj 0.519

uncheckable

adj 0.517

foiled

adj 0.517

unbreakable

adj 0.516

ironclad

adj 0.516

incontestable

adj 0.515

fallible

adj 0.515

unflappable

adj 0.514

rainproof

adj 0.514

unfaltering

adj 0.513

untraceable

adj 0.513

well-tried

adj 0.512

uncomplicated

adj 0.512

proof

adj 0.511

easy as pie

adj 0.511

irrebuttable

adj 0.511

easy peasy

adj 0.510

windproof

adj 0.508

unsusceptible

adj 0.508

easy

adj 0.508

flameproof

adj 0.507

unstoppable

adj 0.506

inarguable

adj 0.505

unarguable

adj 0.505

indisputable

adj 0.503

unfixable

adj 0.502

trustworthy

adj 0.502

unfalsified

adj 0.501

inviolable

adj 0.500

dependable

adj 0.500