I am, temporarily, both sinister and gauche. Sinister comes from the fact that bad omens were believed to appear on the left hand side (or west side if you're facing north like a good soothsayer). Gauche because to be gauche is to be as clumsy as someone who uses their left hand.
Even the word left comes from the Old English lyft meaning weak and foolish.
Etymology is no comfort to someone who can't use his right hand. I am maladroit.
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 on November the first, but you can already order it from these lovely people: