| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | guaranteed not to fail |
| Synonyms: | confident, covered, foolproof, protected, reliable, reliant, safeguarded, secure, sound, sure |
| Main Entry: | sure-fire |
| Part of Speech: | adjective |
| Definition: | dependable |
| Synonyms: | certain, excellent, fail-safe, foolproof, good, infallible, reliable |