a. [ Stead + fast, that is, fast in place. ] [ Written also stedfast. ]
Abide steadfast unto him [ thy neighbor ] in the time of his trouble. Ecclus. xxii. 23. [ 1913 Webster ]
Whom resist steadfast in the faith. 1 Pet. v. 9. [ 1913 Webster ]
adv. In a steadfast manner; firmly. [ 1913 Webster ]
Steadfastly believe that whatever God has revealed is infallibly true. Wake. [ 1913 Webster ]
n. The quality or state of being steadfast; firmness; fixedness; constancy. “The steadfastness of your faith.” Col. ii. 5. [ 1913 Webster ]
To prove her wifehood and her steadfastness. Chaucer. [ 1913 Webster ]