Polysyllabic

The adjective 'polysyllabic' is polysyllabic.

Sedulously avoid all polysyllabic profundity, pompous prolixity, psittaceous vacuity, ventriloquial verbosity, and vaniloquent vapidity.

"Antidisestablishmentarianism" definitely qualifies as a polysyllabic word.

I have a particularly off-putting predilection for the utilization of ponderously polysyllabic linguistic constructions.