In short, their attitude was not that which one would have expected in men who professed to despise all trivialities, all foolish mundane conventions, and indeed everything, except their own personal interests.
There are no more uses of "mundane" in the book.
Show samples from other sources
I’m going to have to spend all of Saturday running errands and doing mundane chores.
Her art mesmerizes us with mundane objects by blowing them out of proportion.