Words unclear on the concept

Perspicuous:  (pr-spky-s)

adj.

1. Clearly expressed or presented; easy to understand: perspicuous prose.

2. Expressing oneself clearly and effectively: a perspicuous lecturer.

I admit it - I never looked this one up. But Zizek did. Leave it to the philosophers to use an obscure, difficult-to-pronounce term to mean "communicate clearly and effectively."