Gloomy and glum are the opposite of cheerful. They begin with the letter G.
Glut
Given
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.
cheery Cheerful.
riant
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.