[syn: distressing, distressful, disturbing, perturbing, troubling, worrisome, worrying]
The Collaborative International Dictionary of English v.0.48:
Worry \Wor"ry\, v. t. [imp. & p. p. Worried; p. pr. & vb. n.
   Worrying.] [OE. worowen, wirien, to strangle, AS. wyrgan in
   [=a]wyrgan; akin to D. worgen, wurgen, to strangle, OHG.
   wurgen, G. w["u]rgen, Lith. verszti, and perhaps to E.
   wring.]
   [1913 Webster]
   1. To harass by pursuit and barking; to attack repeatedly;
      also, to tear or mangle with the teeth.
      [1913 Webster]
            A hellhound that doth hunt us all to death;
            That dog that had his teeth before his eyes,
            To worry lambs and lap their gentle blood. --Shak.
      [1913 Webster]
   2. To harass or beset with importunity, or with care an
      anxiety; to vex; to annoy; to torment; to tease; to fret;
      to trouble; to plague. "A church worried with
      reformation." --South.
      [1913 Webster]
            Let them rail,
            And worry one another at their pleasure. --Rowe.
      [1913 Webster]
            Worry him out till he gives consent.  --Swift.
      [1913 Webster]
   3. To harass with labor; to fatigue. [Colloq.]
      [1913 Webster]
WordNet (r) 3.0 (2006):
worrying
    adj 1: causing distress or worry or anxiety; "distressing (or
           disturbing) news"; "lived in heroic if something
           distressful isolation"; "a disturbing amount of crime";
           "a revelation that was most perturbing"; "a new and
           troubling thought"; "in a particularly worrisome
           predicament"; "a worrying situation"; "a worrying time"
           [syn: distressing, distressful, disturbing,
           perturbing, troubling, worrisome, worrying]
    n 1: the act of harassing someone [syn: badgering, worrying,
         torment, bedevilment]
    2: the act of moving something by repeated tugs or pushes;
       "vigorous worrying finally loosened the saw"
Moby Thesaurus II by Grady Ward, 1.0:
43 Moby Thesaurus words for "worrying":
   aggravating, annoying, bothering, bothersome, chafing, disquieting,
   distressful, distressing, disturbing, exasperating, fretting,
   galling, harassing, harassment, importunate, importune, irking,
   irksome, irritating, pesky, pestering, pestiferous, pestilent,
   pestilential, plaguesome, plaguey, plaguing, provoking, teasing,
   tiresome, torment, tormenting, troublesome, troubling, upsetting,
   vexatious, vexing, wearisome, worriedness, worries and cares,
   worriment, worrisome, worry