Gloomy and glum are the opposite of cheerful. They begin with the letter G.
Glut
Given
Jovial or cheerful.
The opposite of "bright" is usually "dim." The "g" may be incorrect.
Appealing, bright, comfortable, nice, pleasant, sunny...
happy, cheerful, elated. calm.
One antonym for clumsy is graceful.
Cheerful, elated and happy. Comforted, joyful and pleased.
riant
Sombre means to be gloomy, dull or solemn. The opposite therefore is is to be bright and breezy, cheerful, happy, lighthearted and generally in a happy mood.
In Cinderella, the mouse sidekick starting with "G" is Gus, short for Gus Gus. He is one of Cinderella's loyal friends who helps her throughout the story, particularly in her efforts to attend the royal ball. Gus is known for his cheerful personality and clumsy antics, making him a beloved character in the tale.
The opposite of the verb to cross is not to cross. Where it means to cross (betray) someone, the opposite would be to abet, assist, or support.The opposite of cross (cranky, in bad spirits) could be cheerful, happy, or amiable.