The Collaborative International Dictionary of English v.0.48:

Disquiet \Dis*qui"et\, v. t. [imp. & p. p. Disquieted; p. pr.
   & vb. n. Disquieting.]
   To render unquiet; to deprive of peace, rest, or tranquility;
   to make uneasy or restless; to disturb.
   [1913 Webster]

         Why art thou cast down, O my soul, and why art thou
         disquieted within me?                    --Ps. xlii.
                                                  11.
   [1913 Webster]

         As quiet as these disquieted times will permit. --Sir
                                                  W. Scott.

   Syn: To harass; disturb; vex; fret; excite; agitate.
        [1913 Webster]

WordNet (r) 3.0 (2006):

disquieting
    adj 1: causing mental discomfort; "the disquieting sounds of
           nearby gunfire"