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jovial [jovial 词源字典]: jovial: [16] Etymologically, jovial simply means ‘born under the influence of the planet Jupiter’. It comes via French from Italian gioviale, a derivative of Giove ‘Jupiter’, which itself goes back to the Latin stem Jov- (from which English also gets Jove [14], as in by Jove!). Jupiter was thought of as endowing those born under its sign with happiness, and so by extension jovial came to mean ‘jolly, good-humoured’. The word Jupiter [13] itself represents a Latin compound of Jov- and pater ‘father’.
[jovial etymology, jovial origin, 英语词源]
good-humored (adj.): also good-humoured, 1660s, from good (adj.) + past participle adjective from humor (v.). Related: Good-humoredly.