Word meaning 'circuslike' used to describe Trump's campaign

I found "circensian," which Merriam-Webster has as: "of or relating to the Circus in ancient Rome." That was suggested on this Writers Stack Exchange thread.

I also think "buffoonish" might work, which is the adjective form of "buffoon":

1. a person who amuses others by tricks, jokes, odd gestures and postures, etc.

2. a person given to coarse or undignified joking.

-Dictionary.com

It's not a three syllable word, so likely not what you are seeking, but perhaps madcap [OED] is a good fit?

Amusingly eccentric

Also check out Merriam-Webster's definition:

marked by capriciousness, recklessness, or foolishness