Is Klingon a Limited Language?
In klingon, is it possible to describe everything that is possible to describe in English?
The vocabulary of Klingon is smaller than English, but it's still growing. It'll never equal English — English has a particularly large vocabulary for any language — but what it's got can be used efficiently.
But you'll be hard-pressed to find lots of things that you can say in English that you can't find some way to say in Klingon.