The Collaborative International Dictionary of English v.0.48:

Scary \Sca"ry\, n. [Prov. E. scare scraggy.]
   Barren land having only a thin coat of grass. [Prov. Eng.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Scary \Scar"y\, a. [From Scare.]
   1. Subject to sudden alarm. [Colloq. U. S.] --Whittier.
      [1913 Webster]

   2. Causing fright; alarming. [Colloq. U. S.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

scary
    adj 1: provoking fear terror; "a scary movie"; "the most
           terrible and shuddery...tales of murder and revenge"
           [syn: chilling, scarey, scary, shivery,
           shuddery]