steadfastly

/ˈsted-ˌfast/

Middle English stedefast, from Old English stedefæst, from stede + fæst fixed, fast

adjective

  1. firmly fixed in place : immovable

  2. not subject to change

  3. firm in belief, determination, or adherence : loyal

the steadfast doctrine of original sin

faithful loyal constant staunch steadfast resolute mean firm in adherence to whatever one owes allegiance. faithful implies unswerving adherence to a person or thing or to the oath or promise by which a tie was contracted. loyal implies a firm resistance to any temptation to desert or betray.