Facetious Synonyms: bantering, tongue-in-cheek
Facetious Sentence: The teacher sent the student out of the class for giving a facetious answer to a question asked by him.
Under The Lens: All Vowels In Order
Facetious is one of the few words which have all five vowels (a, e, i, o, u) in order. Only other commonly used word which also has the five vowels in order is abstemious.