Somber
Part of speech: adjective
Definition: Dark or dreary in character; joyless, and grim. Dark, lacking color or brightness.
Example sentence: So much of what comes out of the faith community seems so dour and somber, and we want to say, 'Hey, we're real people. You can be a person of faith and really enjoy life and laugh.'
Colorless
Part of speech: adjective
Definition: Having little or no colour.