How do use facetious?

Jack's facetious tone did not sit well with the stoic board members.

Facetious(adj.) - intended to be humorous or playful, usually to a serious issue Sentence: With a smile on his face, he intended to be facetious, however Tom was not really happy with it. I was...

He was being facetious, so don't take him seriously.

Yes, I can.

Facetious remarks or a joke or two are an excellent way to begin a speech, no matter how formal or serious the topic is, since humour is the best audience attention-grabber.