The Collaborative International Dictionary of English v.0.48:

Disquiet \Dis*qui"et\, a.
   Deprived of quiet; impatient; restless; uneasy. [R.] --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Disquiet \Dis*qui"et\, n.
   Want of quiet; want of tranquility in body or mind;
   uneasiness; restlessness; disturbance; anxiety. --Swift.
   [1913 Webster]

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):

disquiet
    n 1: a feeling of mild anxiety about possible developments [syn:
         anxiousness, disquiet]
    2: the trait of seeming ill at ease [syn: disquiet, unease,
       uneasiness]
    v 1: disturb in mind or make uneasy or cause to be worried or
         alarmed; "She was rather perturbed by the news that her
         father was seriously ill" [syn: perturb, unhinge,
         disquiet, trouble, cark, distract, disorder]

Moby Thesaurus II by Grady Ward, 1.0:

231 Moby Thesaurus words for "disquiet":
   afflict, affright, agitate, agitation, ailment, alarm, all-overs,
   angst, anguish, anxiety, anxiety hysteria, anxiety neurosis,
   anxious bench, anxious concern, anxious seat, anxiousness,
   apprehension, apprehensiveness, be tedious, beat, beat up, bluster,
   bobbery, boil, boiling, bore, boredom, bother, brouhaha, burden,
   bustle, cankerworm of care, care, cheerlessness, chills of fear,
   churn, churn up, cold creeps, cold shivers, cold sweat, commotion,
   concern, concernment, conturbation, convulse, creeps,
   curdle the blood, didder, disarrange, discombobulate, discomfort,
   discompose, discomposure, disconcert, discontent, dislike,
   disorder, displeasure, disquietude, dissatisfaction, distress,
   disturb, disturbance, dithers, dread, dullness, ebullition,
   electrify, embroilment, emptiness, ennui, excite, excitement,
   existential woe, fear, fear and trembling, ferment, fermentation,
   fever, feverishness, fidgetiness, fidgets, flap, flatness, flurry,
   fluster, flutter, flutteration, foment, foreboding, forebodingness,
   frazzle, fret, fright, frighten, fume, funk, fuss, give concern,
   goose bumps, gooseflesh, grimness, heartquake, heaving,
   horripilate, horripilation, hubbub, hurly-burly, inquietude, jar,
   jimjams, jitters, jolt, joylessness, jumpiness, lack of pleasure,
   leave unsatisfied, load with care, maelstrom, make one tremble,
   malaise, misgiving, moil, nausea, nerviness, nervosity,
   nervous strain, nervous tension, nervousness, nongratification,
   nonsatisfaction, overanxiety, paddle, painfulness, palpitation,
   panting, perturb, perturbate, perturbation, pins and needles,
   pitapat, pitter-patter, pucker, put to it, quaking, quaver,
   quavering, quiver, quiver of terror, quivering,
   raise apprehensions, rattle, restiveness, restlessness, rile,
   ripple, rock, roil, roughen, rout, row, ruffle, rumple,
   savorlessness, scare, seethe, seething, shake, shake up, shakes,
   shaking, shiver, shivers, shock, shudder, solicitude, spleen,
   spook, stagger, staleness, startle, stew, stir, stir up, strain,
   suspense, sweat, swirl, tastelessness, tediousness, tedium,
   tension, thrill of fear, throb, throbbing, to-do, tremble,
   trembling, tremor, trepidation, trepidity, trouble, tumult,
   tumultuation, turbidity, turbulence, turmoil, twitter,
   uncomfortableness, unease, uneasiness, unhappiness, unhinge, unman,
   unnerve, unpleasure, unquietness, unrest, unsatisfaction, unsettle,
   unstring, untune, upset, vexation, vexation of spirit, whip,
   whip up, whisk, work up, worry, zeal