foolproof

Words with a similar base: foolproof

'foolproof'

[goofproof.v.01] as in: proof against human misuse or error

'foolproof'

[foolproof.s.01] as in: not liable to failure

Examples:
a foolproof identification system
the unfailing sign of an amateur
an unfailing test

Origins

					foolproof (English)
├── -proof (English)
└── fool (English)
    └── fol (Middle English (1100-1500))
        └── fol (Old French (842-ca. 1400))
            └── follis (Latin)

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