Origin: Germanic Old English suffix
Shadiness has 3 different meanings across 1 category:
relative darkness caused by light rays being intercepted by an opaque body
"it is much cooler in the shade"
"there's too much shadiness to take good photographs"
questionable honesty or legality
"they acted with such obvious shadiness that they were instantly recognizable"
"the shadiness of their transactions"
The property of being shady.