Pick out the antonym of the word ‘jocundʼ.

The word 'jocund' refers to someone who is cheerful and light-hearted. The antonym of 'jocund' would refer to a person who is sad and/or serious. 'Jealous' is not an exact antonym of 'jocund' and can be eliminated. 'Cheerful', rather than being an antonym, is a synonym of 'jocund' and will also be eliminated. 'Optimistic' refers to someone who keeps a positive perspective on things, and is closer to being a synonym of 'jocund' than being an 'antonym'. The best possible choice is option C; 'gloomy' refers to someone who is depressed and frightened. Option C is the correct answer.