I've always enjoyed perambulate, postprandial, obsequiousness, and folderol.
Offhand, these words seem fitting for formal writing.
I had to look up folderol. I see it has a long history of use but it doesn't thrill me. The sound doesn't seem to fit the meaning, perhaps it's because it's not likely to turn up in conversation. But it is an uppity word. It sounds like a pain killer. I am not fond of balderdash but it works for me, a nonsense word in itself. I haven't done any looking up but there are probably a lot of wacky sounding synonyms.
Three of your words begin with F. Poor obsequiousness is all alone. The quality of his very essence might help it get along (since he is outnumbered). And O comes before P, so he can rub that in. I'm being silly because I like to indulge in rank folderol whenever possible. Ouch, it doesn't sound right.
"After stuffing our faces by slamming down the carcass bone and all, we indulged in the postprandial treat of dark bock while enjoying a game of skin the donkey." Although this word would be more at home in a uppity costume drama.
"The migration of this particular convocation of worms grew and grew and soon was a major perambulation as it made its way to devour Polonius."
Alas, poor Polonius.
These are like words created by the medical profession to replace the 1 or 2 syllable ones which the other 99 % of the world uses to describe things.