adj. - Used to describe especially patriotic lighting.
"O say, can you see, by the donzerly light"
dim and intermittent, used to describe light that is caused by distant and sporadic sources, such as window light in the country or starlight when it is partly cloudy.
In the Star-Spangled Banner, the donzerly light comes from the explosions ("rockets' red glare, the bombs bursting in air").
"Oh say can you see, by the donzerly light..."