Gloomy and glum are the opposite of cheerful. They begin with the letter G.
Given
The opposite of "bright" is usually "dim." The "g" may be incorrect.
feast
One antonym for clumsy is graceful.
A pig famine would be the opposite of a sausage feast.
Glut.
They went to the landlords when they had no money during the famine
Yes, at least idiomatically, there is either "feast or famine."The word feast (banquet) does not have any direct opposite, but as a verb it could also be to fast, to abstain, to diet, or more extemely to starve.
negative G
The antonym (opposite) would be abundance, plenty, or (in some cases) profusion.
A mood starting with G is generous.