1. Infallible or unfailing
2. Certain not to fail
3. Physically secure or dependable
4. (Of persons) Worthy of trust or confidence; SYN. trusted.
TRUE · bound · careful · certain · confident · convinced · dependable · destined · doomed · fated · foreordained · in for · indisputable · positive · predestinate · predestined · predictable · reliable · secure · steady · trusted · trustworthy · trusty
Surely
certainly · for certain · for sure · sure as shootin · sure enough · surely