1. 
[syn: shade, shadiness, shadowiness]
2.  of questionable honesty or legality; 
- Example: "they acted with such obvious shadiness that they were instantly recognizable"
- Example: "the shadiness of their transactions"
The Collaborative International Dictionary of English v.0.48:
Shadiness \Shad"i*ness\, n.
   Quality or state of being shady.
   [1913 Webster]
WordNet (r) 3.0 (2006):
shadiness
    n 1: 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" [syn: shade,
         shadiness, shadowiness]
    2: of questionable honesty or legality; "they acted with such
       obvious shadiness that they were instantly recognizable";
       "the shadiness of their transactions"