Meaning

adjective marked by firm determination or resolution; not shakable

adjective firm and dependable especially in loyalty

originFrom Middle English stedefast, from Old English stedefæst, from Proto-Germanic *stadifastuz, equivalent to stead (“place; spot; position”) + fast (“firm; fixed”). Cognate with Middle Dutch stedevast (“steadfast”), Icelandic staðfestur (“steadfast”), Danish stedfast (“firmly attached, secured”), Danish stadfæste (“to confirm; ratify”), Norwegian Nynorsk stadfesta (“confirm, ratify; establish”),…

Etymology from Wiktionary, CC BY-SA 3.0