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"

Moby Thesaurus II by Grady Ward, 1.0:

78 Moby Thesaurus words for "disquieting":
   agitating, alarming, annoying, awing, bothersome, breathtaking,
   chafing, charged, chilling, cliff-hanging, daunting, deterrent,
   deterring, disconcerting, discouraging, disheartening, dismaying,
   distracting, distressful, distressing, disturbing, electric,
   exciting, exhilarating, fear-inspiring, fearful, fearsome,
   fretting, frightening, frightful, galvanic, harassing, heady,
   heart-expanding, heart-stirring, heart-swelling, heart-thrilling,
   impressive, inflammatory, intoxicating, jarring, jolting,
   maddening, mind-blowing, moving, overawing, overcoming,
   overmastering, overpowering, overwhelming, perturbing, piquant,
   plaguing, provocative, provoking, ravishing, scaring, scary,
   soul-stirring, spirit-stirring, startling, stimulating,
   stimulative, stirring, striking, suspenseful, suspensive,
   tantalizing, telling, thrilling, thrilly, tormenting, troublesome,
   troubling, unsettling, upsetting, worrisome, worrying