failsafe / fail-safe [fayl-seyf]
adjective
1. guaranteed to work; reliable.
noun
2. something designed to work or function automatically to prevent breakdown of a mechanism, system, or the like.
EX. Few fail-safes are reliable in life. Whether short-sighted, short-term, short on time, short on cash, or short on ideas, what makes sense to you after spending a decade build a complex labyrinth that you only know the layout of and raising a 12-legged beast who never sleeps to roam the halls, odds are you are gonna slip up somewhere in the final stages of your five-year-plan.