Why “steadfastness” is a great word
The quality of being resolutely or dutifully firm and unwavering, especially in loyalty, purpose, or belief. From Middle English *stedfastnesse*, from Old English *stedefæstnes* ('steadfastness'), equivalent to *steadfast* (from Old English *stedefæst*, meaning 'firm in place, constant,' from *stede* ('place, position') + *fæst* ('fixed, firm')) + the noun-forming suffix *-ness*. Unlike obstinacy, which implies a stubborn, often unreasonable adherence, or flexibility, which denotes a capacity to adapt, steadfastness is a principled and often silent vow. It is the oak that holds its ground through the gale, the lighthouse keeper tending his lens through the long, black watches, and the simple act of returning, day after day, to a task that may never be finished—a quiet rebuttal to a world that mistakes change for progress.
Etymology
From Middle English stedfastnesse, stedefastnesse, from Old English stedefæstnes (“steadfastness”), equivalent to steadfast + -ness.