I believe Anglo- and Franco- used to be pretty common, at least until the former came to mean anyone who doesn’t speak Spanish, and the latter was besmirched by associations with a Spanish dictator and a sugared orange pasta product.
Groovy. Ya just don’t hear Groovy enough these days.
Nincompoop.
When I heard Jack Nicholson say it in About Schmidt several years ago, it stopped me cold. Especially the way he says it: “My daughter married a ninnn-commm-poop.”
On these boards?
“I don’t know.”
Perhaps.
Tertiary.
Doncha just love words?
You whippersnappers ought to kowtow to your elders. If not, show some gumption and get off your arse and partake in political discourse.
Pillock is a favourite of mine that rarely gets much airtime these days.
Confound, Accursed, Merrily, and Deft are others that one doesn’t often hear in the course of casual conversation, either…
Conflagration.
These are right up there with “dolt”:
a dull, stupid person; blockhead.
You’ll be happy to know I use both blatherskite and smite. Both are very useful in the villainy business. Forsooth I mostly abjure, though, and mandragons are not to be trusted.
leaf
You clearly haven’t been paying much attention to my posts. “Arse” makes regular daily appearances. 
Oh, and here I thought you were just a New Yorker who didn’t know how to pronounce “ours”…as in, “Yo, dem beers are arse.”