Moody (adjective)

1. Given to sudden and unaccountable changes of mood; temperamental.
2. Depressed in spirits; gloomy.
3. Indicative or expressive of a particular mood or emotion; atmospheric.

Origin:

Middle english moodi, from old english modig "proud, brave".

Examples:

1. He was a moody child, prone to sudden outbursts of anger.
2. She was feeling moody and didn't want to talk to anyone.
3. His moody paintings depicted the dark and gloomy side of life.
4. The moody music set the tone for the film's dramatic scenes.
5. The stormy sky and moody light made for a perfect setting for the photo shoot.