The Archbishop of Canterbury is multilingual. He speaks German, English and his native tongue is Welsh. I believe he speaks at least two other languages. He is quite the linguist.
I doubt anyone was curious, but the Welsh word for idiot is 'idiot'. It is pronounced exactly as it is in English. Isn't that handy?
Another fun Welsh phrase is 'caead dy ceg'. This means 'shut your mouth' or 'shut up'.