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idiot proof

see definition of idiot proof
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Synonyms for idiot proof

adj infallible
  • flawless
  • reliable
  • sure-fire
  • unassailable
  • goofproof
  • guaranteed
  • perfect
  • tested
  • tried
  • certain
  • dependable
  • fail-safe
  • faultless
  • idiot-proof
  • never-failing
  • safe
  • sure
  • unerring
  • unfailing
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.