Two words which have fallen out of use, according to Radio 4.
How about reviving them? Today. See if you can slip them into conversation. Somehow.
9. Snollygoster
A 19th century American term for an unprincipled, dishonest person, especially a politician.
10. Mumpsimus
An obstinate person who holds on rigidly to a certain set of beliefs even though they are wrong or disproved. The term may have been coined by Erasmus.