A dying word; I suggest you avoid it. On-line concordances dredge up a single example:
...so faint that even in that stilly night I could hardly hear it.
When leafing through Oxfod dictionary this morning, I found the word "stilly" derivative of still. Could you please help me to use the same in a sentence?
I agree. I've only ever met it in poetry, usually collocated with "night" (and maybe also with "depths").