I seldom use the word seldom. Indeed, doing intensive fieldwork for the last few days, I have noticed that seldom is never used at all. It's not that there's no call for the word: the need is frequent. But seldom has been beaten out by the upstart "don't often" "not often". These are longer and have none of seldom's beauty. Say seldom aloud. Go on.
The Horologicon is a book of the strangest and most beautiful words in the English language arranged by the hour of the day when you will really need them. Words for breakfast, for commuting, for working, for dining, for drinking and for getting lost on the way home. It runs from uhtceare (sadness before dawn) to curtain lecture (a telling off given by your spouse in bed). It's out all over the world and you can buy it from these lovely people: