An underused word for your consideration: "scug" - a Victorian schoolboy insult denoting a pushy, slovenly, morally undeveloped slacker with bad manners and far too high an opinion of himself.
(All that in one syllable! If that's not 19th century efficiency I don't know what is.)
If it's good enough to be employed by those most worthy knights P. G. Wodehouse and Terry Pratchett, I deem it good enough for us. I use it myself. Care to join me?
#scug #insults #Wodehouse #Pratchett