| Main Entry: | fail-safe |
| Part of Speech: | adjective |
| Definition: | guaranteed not to fail |
Synonyms: |
confident, covered, foolproof, protected, reliable, reliant, safeguarded, secure, sound, sure |
| Main Entry: | foolproof |
| Part of Speech: | adjective |
| Definition: | infallible |
Synonyms: |
certain, dependable, fail-safe, faultless, flawless, goofproof, guaranteed, idiot-proof, never-failing, perfect, reliable, safe, sure, sure-fire, tested, tried, unassailable, unerring, unfailing |
| Main Entry: | sure-fire |
| Part of Speech: | adjective |
| Definition: | dependable |
Synonyms: |
certain, excellent, fail-safe, foolproof, good, infallible, reliable |