The Collaborative International Dictionary of English v.0.48:

Perturbed \Per*turbed"\, a.
   Agitated; disturbed; troubled. --Shak. -- Per*turb"ed*ly,
   adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

perturbed
    adj 1: thrown into a state of agitated confusion; (`rattled' is
           an informal term) [syn: flustered, hot and
           bothered(p), perturbed, rattled]

Moby Thesaurus II by Grady Ward, 1.0:

134 Moby Thesaurus words for "perturbed":
   abashed, abroad, adrift, afflicted, agitated, all-overish, amiss,
   annoyed, anxious, anxioused up, apprehensive, askew, astray,
   at sea, awry, balled-up, beset, bewildered, bothered, cast down,
   chagrined, chaotic, chapfallen, clueless, cockeyed, concerned,
   confused, convulsed, deranged, disarranged, discomfited,
   discomforted, discomposed, disconcerted, dislocated, dismayed,
   disordered, disorderly, disorganized, disoriented, disquieted,
   distracted, distraught, distressed, disturbed, embarrassed,
   excited, fearful, feverish, fidgety, flurried, flustered,
   fluttered, foreboding, fussed, guessing, harassed, haywire,
   hung up, ill at ease, in a fix, in a jumble, in a maze,
   in a pickle, in a pother, in a pucker, in a scrape, in a stew,
   in a sweat, in a swivet, in a tizzy, in disorder, inconvenienced,
   irked, jittery, jumbled, jumpy, lost, mazed, misgiving, misplaced,
   mixed-up, mortified, nervous, nervy, off the track, on tenterhooks,
   on the fritz, out of countenance, out of gear, out of joint,
   out of kelter, out of kilter, out of order, out of place,
   out of tune, out of whack, overanxious, overapprehensive,
   perplexed, plagued, put to it, put-out, put-upon, puzzled, rattled,
   restless, roily, ruffled, shaken, shaken up, shook, shuffled,
   solicitous, sore beset, stirred up, strained, suspenseful, tense,
   troubled, troublous, turbid, turbulent, turned around,
   uncomfortable, uneasy, unpeaceful, unquiet, unsettled, upset,
   vexed, without a clue, worried, zealous