According to the editors of the American Heritage dictionaries, these are the 100 words every high school graduate should know.
Does anyone actually say "jejune" aloud these days? I'm sure it's been more than 10 years since I heard it in conversation, from the mouth of a former manager who spent his time criticizing me when I was around and going through my desk when I wasn't. At a business dinner, he once asked if the group would like to get dessert in order to "ameliorate the meal." Such awkward use of language caused me to not take anything he said seriously, and I was convinced he had a secret word-of-the-day calendar.
Full disclosure: I had to look up "bowdlerize" and "moiety."
Via Books, Words, and Writing.