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