The phrase "shadowy side" is correct and usable in written English.
It can be used to describe a darker side, or hidden secrets and motives behind a person or situation. For example: "The politician had a shadowy side that few knew about until the truth came out."
Then it slowly turns to show its shadowy side.
He reveals the city's humorous, artistic, profound and shadowy side.
Yet its older, gothic, shadowy side speaks of evil and madness.
But it's the shadowy side, and none of us can see the bottom.
There was a shadowy side to this extraordinary period in American manufacturing, consumption and innovation, of course.
Jonathan Kellerman writes tales of crime and detection which expose the shadowy side of glittering Los Angeles.
Here, she harnesses the power of reflected light, as it warms the shadowy sides of the fruit.
Below the thunders of the upper deep, Far, far beneath in the abysmal sea, His ancient, dreamless, uninvaded sleep The Kraken sleepeth: faintest sunlights flee About his shadowy sides; above him swell Huge sponges of millenial growth and height; And far away into the sickly light, From many a wondrous grot and secret cell Unnumber'd and enormous polypi Winnow with giant arms the slumbering green.
But it also spills over into a stoic acceptance of and openness to humanity's shadowy sides, from substance abuse to mental health issues.
I was usually alone – only brave kids would ever climb the back of the Tiger from the shadowy north side, which was infested by rats and snakes.
Everything is painted black, which may be overdoing it, but as an evocation of the shadowy, depressive side of the American experience and a meditation on death, it exerts a grim poetic mystery.
