The Collaborative International Dictionary of English v.0.48:

Bother \Both"er\, v. t. [imp. & p. p. Bothered (?); p. pr. &
   vb. n. Bothering.] [Cf. Ir. buaidhirt trouble, buaidhrim I
   vex.]
   To annoy; to trouble; to worry; to perplex. See Pother.
   [1913 Webster]

   Note: The imperative is sometimes used as an exclamation
         mildly imprecatory.
         [1913 Webster]

WordNet (r) 3.0 (2006):

bothered
    adj 1: caused to show discomposure; "refused to be fazed by the
           objections" [syn: bothered, daunted, fazed]

Moby Thesaurus II by Grady Ward, 1.0:

115 Moby Thesaurus words for "bothered":
   abashed, abroad, adrift, afflicted, aggravated, agitated,
   all-overish, angry, annoyed, anxious, anxioused up, apprehensive,
   astray, at sea, balled-up, beset, bewildered, browned-off, bugged,
   burnt-up, cast down, chafed, chagrined, chaotic, chapfallen,
   clueless, concerned, confused, discomfited, discomforted,
   discomposed, disconcerted, dismayed, disordered, disorganized,
   disoriented, disquieted, distracted, distraught, distressed,
   disturbed, embarrassed, exasperated, fearful, flustered, fluttered,
   foreboding, fussed, galled, griped, guessing, harassed, 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, inconvenienced, irked, irritated, jumbled,
   lost, mazed, miffed, misgiving, mixed-up, mortified, nervous,
   nettled, off the track, on tenterhooks, out of countenance,
   overanxious, overapprehensive, peeved, perplexed, perturbed,
   piqued, plagued, provoked, put to it, put-out, put-upon, puzzled,
   rattled, resentful, riled, roiled, ruffled, shaken, shook,
   shuffled, solicitous, sore beset, strained, suspenseful, tense,
   troubled, turned around, uncomfortable, uneasy, unsettled, upset,
   vexed, without a clue, worried, zealous