Is there an obsolete word for 'obsolete'?

Matador Network has posted 20 obsolete English words that should make a comeback. I like numbers 4 and 5:

4. Kench Verb intr. – “To laugh loudly” – This Middle English word sounds like it would do well in describing one of those times when you inadvertently laugh out loud while reading a text message in class and manage to thoroughly embarrass yourself.

5. Ludibrious Adj. – “Apt to be a subject of jest or mockery” – This word describes a person, thing or situation that is likely to be the butt of jokes. Use it when you want to sound justified in poking fun at someone. “How could I resist? He’s just so ludibrious.”

I am kenching all the time at work which makes me ludibrious.