Definitions:

1. Describes the manner in which something is said or done in a joking or humorous way, often with a sense of sarcasm or irony, particularly when the subject matter is serious or sensitive. ADVERB
   • He facetiously suggested that we solve the budget crisis by printing more money.
2. Implies that the speaker is not being serious and is instead aiming to amuse or lighten the mood, sometimes inappropriately. ADVERB
   • During the serious discussion about climate change, he facetiously commented that we should all just move to Mars.
3. Refers to behavior or statements that are not taken seriously because they are joking, sarcastic, or humorously playful. ADVERB
   • Se facetiously remarked that the best way to avoid stress is to not work at all.

Synonyms:

• Flippantly
• irreverently
• jokingly
• playfully
• sarcastically