The Collaborative International Dictionary of English v.0.48:

Trim \Trim\, v. t. [imp. & p. p. Trimmed; p. pr. & vb. n.
   Trimming.] [OE. trimen, trumen, AS. trymian, trymman, to
   prepare, dispose, make strong, fr. trum firm, strong; of
   uncertain origin.]
   1. To make trim; to put in due order for any purpose; to make
      right, neat, or pleasing; to adjust.
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            The hermit trimmed his little fire.   --Goldsmith.
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   2. To dress; to decorate; to adorn; to invest; to embellish;
      as, to trim a hat.
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            A rotten building newly trimmed over. --Milton.
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            I was trimmed in Julia's gown.        --Shak.
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   3. To make ready or right by cutting or shortening; to clip
      or lop; to curtail; as, to trim the hair; to trim a tree.
      " And trimmed the cheerful lamp." --Byron.
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   4. (Carp.) To dress, as timber; to make smooth.
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   5. (Naut.)
      (a) To adjust, as a ship, by arranging the cargo, or
          disposing the weight of persons or goods, so equally
          on each side of the center and at each end, that she
          shall sit well on the water and sail well; as, to trim
          a ship, or a boat.
      (b) To arrange in due order for sailing; as, to trim the
          sails.
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   6. To rebuke; to reprove; also, to beat. [Colloq.]
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   To trim in (Carp.), to fit, as a piece of timber, into
      other work.

   To trim up, to dress; to put in order.
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            I found her trimming up the diadem
            On her dead mistress.                 --Shak.
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WordNet (r) 3.0 (2006):

trimmed
    adj 1: made neat and tidy by trimming; "his neatly trimmed hair"
           [syn: trimmed, cut] [ant: uncut, untrimmed]

Moby Thesaurus II by Grady Ward, 1.0:

112 Moby Thesaurus words for "trimmed":
   abbreviated, abridged, abstracted, adorned, all up with, beaded,
   beat, beaten, bedecked, bedizened, befrilled, bejeweled,
   beribboned, bespangled, bested, bobbed, bordered, capsule,
   capsulized, clipped, compressed, condensed, confounded, cropped,
   curtailed, cut short, decked, decked out, decorated, defeated,
   digested, discomfited, docked, done for, done in, down, edged,
   elided, elliptic, embellished, fallen, feathered, festooned,
   figured, fimbriated, fixed, floored, flowered, fringed,
   gaff-rigged, garnished, hors de combat, jeweled, laciniate,
   laciniated, lambasted, lateen-rigged, lathered, licked, marged,
   marginate, marginated, margined, mowed, mown, nipped, on the skids,
   ornamented, outdone, overborne, overcome, overmastered,
   overmatched, overpowered, overridden, overthrown, overturned,
   overwhelmed, panicked, plumed, pollard, polled, pruned,
   put to rout, reaped, rigged, routed, ruined, scattered, settled,
   shaved, sheared, short-cut, shortened, silenced, skinned,
   skinned alive, skirted, snub, snubbed, spangled, spangly,
   stampeded, studded, tricked out, trounced, undone, upset, whelmed,
   whipped, worsted, wreathed