Define facetious.
(Can be answered with only one sentence)

treating serious issues with deliberately inappropriate humour

Facetious is most commonly used to describe comments that are intentionally unserious, especially in a way that’s meant to be humorous and perhaps a bit inappropriate or provocative.

one of the central themes of edward abbey's work has been his staunch opposition to the glen canyon dam on the colorado river that created lake powell, destroying stunning scenery and wildlife habitat, endangering many rare species of fish and animals, and also irreparably destroying many important archaeological sites which provided information about the early inhabitants of the united states.

remember, the goal of an adjective clause is to add more information to a noun or a pronoun. as you can see from the examples above, you can add information by including a longer adjective clause or tighten up a sentence by turning the adjective clause into an adjective phrase.