IPA: /ˈstɛd.fæst.li/
KK: /ˈstɛdˌfæstli/
In a firm and unwavering way; showing strong determination and loyalty.
She steadfastly supported her friend during difficult times.
Steadfastly → It is formed from "stead" (from Old English *stede*, meaning place or position) and "fast" (from Old English *fæst*, meaning firm or fixed), combined with the adverbial suffix "-ly" (meaning in a manner of). The word "steadfastly" means in a manner that is firm and fixed in place, showing unwavering loyalty or determination.
Think of being firmly planted in a 'place' ('stead') and being 'fixed' ('fast') — that's how you remember that 'steadfastly' means to do something with unwavering determination.