Facetious
Part of speech: adjective
Definition: Treating serious issues with deliberately inappropriate humor; flippant. Pleasantly humorous, jocular.
Humorous
Part of speech: adjective
Definition: Full of humor or arousing laughter; funny.Showing humor; witty, jocular.Damp or watery.
Example sentence: There's a long tradition - certainly with country, but in all kinds of genres of music - to have humorous lyrics. Certainly with Frank Zappa and the Mothers of Invention and, if you look at country, Roger Miller and Jim Stafford.