Jocund in a sentence as an adjective

The author clearly loves mathematics and knows how to tell a good story.> Conway’s is a jocund and playful egomania, sweetened by self-deprecating charm.

Jocund definitions

adjective

full of or showing high-spirited merriment; "when hearts were young and gay"; "a poet could not but be gay, in such a jocund company"- Wordsworth; "the jolly crowd at the reunion"; "jolly old Saint Nick"; "a jovial old gentleman"; "have a merry Christmas"; "peals of merry laughter"; "a mirthful laugh"

See also: jolly jovial merry mirthful