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say it: FOOL-proof
foolproof is a verb and adjective meaning "proof against human misuse or error". It carries 2 recorded senses.
proof against human misuse or error
“foolproof this appliance”
not liable to failure
“a foolproof identification system”
“the unfailing sign of an amateur”
“an unfailing test”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for foolproof come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.