FOOLPROOF /ˈfuːl ˌpɹuːf/ ► audio Scrabble 17 Words With Friends 19 Definition adjective not liable to failure. — synonyms: unfailing verb proof against human misuse or error. — synonyms: goofproof, goof-proof Examples “We foolproofed the operations.” See all 27 words you can make from FOOLPROOF → 9-letter words Words starting with F Words ending with F ← Unscramble different letters