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foolproof

English

  1. 🔊 not liable to failure
    “a foolproof identification system”
  2. 🔊 proof against human misuse or error
    “foolproof this appliance”

Similar words

goofproof goof-proof unfailing adaptable airtight ballproof bombproof bulletproof burglarproof certain convenient corrosionproof dampproof dependable ductile feasible fire-resisting fireproof flameproof flexible guaranteed handy hermetic holeproof