Rare words 'mutate' faster than common ones

"Scientists have uncovered what might be called the law of language evolution: the more a word is used, the less likely it is to change over time"

Slow day at the office, eh?

It's interesting though. Sure that's common sense, but look at some of the words we have now. Cunt is derived from an Anglo Saxon word for a sheath or scabbard (much like a German word for sheath or scabbard also means vagina). The word queynt in Middle English was a derogatory term for the vagina as well and sounds about the same as the word quaint in modern day English, which has a meaning of being quiet and/or pleasant, I believe.