infallible, bulletproof, surefire, feasible, safe, tamperproof, silver bullet, simple, painless, adequate, inexpensive, magic bullet, reliable, workable, ingenious, unexceptionable, imperfect, easy, watertight, straightforward, proper, plausible, impregnable, surest, credible, untoward, computerized, impossible, conceivable, sensible, invulnerable, necessary, encrypted, accurate, newfangled, sophisticated, hairbrained, doable, ironclad, recommendable, islanding, flawless, timesaving, computerised, counterintuitive, biometric, advisable, user friendly, expedient, rudimentary, stringent, guessable, trustworthy, bombproof, reasonable, airtight, accrual accounting, conclusive, childproof, hygienic, handiest, strict, perfect, wrong, securest, unproblematic, farfetched, automated, convenient, mentionable, preventive, fallible, unscientific, satisfactory, impenetrable, acceptable, transparent, commonsensical, cryptographic, correct, haphazard, useless, unsusceptible, impractical, predictable, effective, duplicatable, implausible, pukka, needful, testable, instantaneous, useful, risky, screwy, tokenless, chancy, curable, washable, smooth, erring, waterproof, stationary, basic, blind, destitute, natural, near, upset, upsetting, absorbing, accommodating, ancient, bereft, boring, coincident, colorless, convincing, defensive, degenerate, despairing, despise, costeffective, simplest, efficient, standardized, defensible, heuristic, optimised, simpler, tested, efficacious, optimized

proof

goofproof, unfailing