From The Collaborative International Dictionary of English v.0.48:
Shadowy \Shad"ow*y\, a. 1. Full of shade or shadows; causing shade or shadow. "Shadowy verdure." --Fenton. [1913 Webster]
This shadowy desert, unfrequented woods. --Shak. [1913 Webster]
2. Hence, dark; obscure; gloomy; dim. "The shadowy past." --Longfellow. [1913 Webster]
3. Not brightly luminous; faintly light. [1913 Webster]
The moon . . . with more pleasing light, Shadowy sets off the face things. --Milton. [1913 Webster]
4. Faintly representative; hence, typical. [1913 Webster]
From shadowy types to truth, from flesh to spirit. --Milton. [1913 Webster]
5. Unsubstantial; unreal; as, shadowy honor. [1913 Webster]
Milton has brought into his poems two actors of a shadowy and fictitious nature, in the persons of Sin and Death. --Addison. [1913 Webster]