faceti- +

Witty or humorous writings and sayings.

1. Playfully jocular; humorous: "He was constantly making facetious remarks."
2. Cleverly amusing in tone; intended to be humorous, but often silly or inappropriate.
3. Lacking serious intent; concerned with something nonessential, amusing, or frivolous: "She was always a facetious person who never took anything seriously."
4. Etymology: from 1592, "polished, urbane; later, given to joking, humorous"; borrowed from French facétieux, from facétie, "a joke"; from Latin facetia, from facetus, "witty, elegant".

1. Not seriously.
2. In a humorous or joking manner.

1. That which is meant to be humorous or funny; not serious.
2. Joking or jesting, often inappropriately; that is, not serious about a serious subject in an attempt to be amusing or to appear clever.