cast-iron

a cast-iron promise or arrangement is one that can be trusted completely (always before noun) No new business comes with a cast-iron guarantee of success.

Common Names:

Name	Pronounced	Usage
Caoimhe	KEE-va, KWEE-va	Irish, Scottish
Corbinianus	-	Late Roman
Nagendra	-	Hinduism, Indian, Kannada, Telugu
Eunice	YOO-nis (English)	Biblical, English, Biblical Latin
Ally (2)	AL-ee	Scottish
Heleentje	hay-LAY:N-tyə	Dutch