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What is the opposite of foolproof?

Need antonyms for foolproof? Here's a list of opposite words from our thesaurus that you can use instead.

Adjective
Opposite of incapable of going wrong or being misused
Adjective
Opposite of always successful, not likely to fail
Adjective
Opposite of without loopholes or weak points
Adjective
Opposite of deserving of trust, or able to be trusted reliably
“Edward had no intention of allowing his untrustworthy brother an independent fiefdom in Europe from which perhaps to launch another attempt to make himself king of England.”
Adjective
Opposite of designed to be easy for an untrained user to use
Adjective
Opposite of proven to be good or workable
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