二人の会話は諧謔に富んでいた。
Their conversation was rich in banter.
smooth-talking and humorous; jocose and comical
The kanji 諧 means 'harmony' or 'jest', and 謔 means 'joke' or 'banter'. The word is a Sino-Japanese compound (kango) combining these two characters, both associated with playful speech. The exact historical derivation is uncertain, but it has been used in literary Japanese to denote witty humor.