sure-fire
Bound to succeed
Sure-fire means certain to succeed or produce the expected result: a sure-fire way to lose weight, a sure-fire hit.
The term suggests guaranteed effectiveness, though it often carries a whiff of salesmanship or overconfidence.
Originally American, from the reliability of a gun that fires every time.
Incapable of failure
- fail-safeAutomatic harm prevention mechanism
- certainFree from doubt
- inevitableCertain to occur
- definiteClearly established, not vague
guaranteed · infallible · unfailing · reliable · dependable · tried-and-true · proven · unbeatable
Achieving victory
- successfulHaving achieved one's aims
- effectiveProducing intended results
- potentHaving great effect
- powerfulHaving great strength
decisive · conclusive · knockout · killer · devastating · lethal · unstoppable · unbeatable
foolproof
Incapable of failure
- fail-safeAutomatic harm prevention mechanism
- certainFree from doubt
- inevitableCertain to occur
definite · guaranteed · infallible · unfailing · reliable · dependable · tried-and-true · proven · unbeatable · no-fail
winning
Achieving victory
- successfulHaving achieved one's aims
- effectiveProducing intended results
- potentHaving great effect
powerful · decisive · conclusive · knockout · killer · devastating · lethal · unstoppable · unbeatable · reliable
formula
Fixed method or notation
- recipeCooking preparation instructions
- strategyPlanned approach to goals
- techniqueSkilled way of performing
approach · system · plan · method · way · solution · tactic · secret · trick · blueprint
sure-fireuncertain
Not firmly known
doubtful · unreliable · iffy · hit-or-miss · questionable