Archaisms are grizzled old words that have continued to do their job despite
their age even though they don’t go around as much as they used to. They are
old-fashioned but serviceable and that’s the reason they are still making
the rounds, as you can see in this week’s examples. They serve a purpose, to
give an aura of an earlier period, and evoke a sense of historical setting,
in novels, religious writing, poetry, ads, and so on. What’s old for one is
young for another, so there’s no consensus on what words are archaic…

— Anu