The word 'fustian' is a noun, a word for a thick, durable twilled cloth made of cotton or flax, usually dyed in dark colors; and a word for pompous or pretentious speech or writing.

The word 'fustian' is an adjective used to describe a noun as cheap and worthless, or pompous and bombastic.

Example:

Cassius Clay, famous for his rodomontade of flatulent self congratulatory praise would reject the accusation of fustian speech first because he did not know what that word meant and second because he would claim that if you can do it it ain't braggin".