full-proof ( synonym found)
Definition of full-proof:

°For a device: protected, or designed to be proof against misuse or error; fail-safe.
°For an idea or plan: infallible, or bulletproof.
Definition of full-proof:

°For a device: protected, or designed to be proof against misuse or error; fail-safe.
°For an idea or plan: infallible, or bulletproof.
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