foolproof

foolproof
    adj 1: not liable to failure; "a foolproof identification
           system"; "the unfailing sign of an amateur"; "an
           unfailing test" [syn: {foolproof}, {unfailing}]
    v 1: proof against human misuse or error; "foolproof this
         appliance" [syn: {goofproof}, {goof-proof}, {foolproof}]
    

54 Moby Thesaurus words for "foolproof":
      adaptable, airtight, ballproof, bombproof, bulletproof,
      burglarproof, certain, convenient, corrosionproof, dampproof,
      dependable, ductile, feasible, fire-resisting, fireproof,
      flameproof, flexible, guaranteed, handy, hermetic, holeproof,
      impervious to, infallible, leakproof, malleable, manageable,
      maneuverable, noiseproof, pliable, pliant, practical, proof,
      proof against, punctureproof, reliable, resistant, rustproof, safe,
      shatterproof, shellproof, soundproof, sure, sure-fire, tight,
      tractable, trustworthy, unfailing, untroublesome, warranted,
      watertight, weatherproof, wieldable, wieldy, yielding