Guaranteed to make teacher look silly about oxygen - Crossword Clue

Below are possible answers for the crossword clue Guaranteed to make teacher look silly about oxygen.

9 letter answer(s) to guaranteed to make teacher look silly about oxygen

FOOLPROOF
  1. not liable to failure; "a foolproof identification system"; "the unfailing sign of an amateur"; "an unfailing test"
  2. proof against human misuse or error; "foolproof this appliance"

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