Wordnet 3.0
NOUN (1)
1. 
 a moderate purple; 
ADJECTIVE (1)
1. 
 of a pale to moderate greyish violet color; 
The Collaborative International Dictionary of English v.0.48:
Mauve \Mauve\ (m[=o]v), n. [F., mallow, L. malva. So named from
   the similarity of the color to that of the petals of common
   mallow, Malva sylvestris. See Mallow.]
   A color of a delicate purple, violet, or lilac.
   [1913 Webster]
   Mauve aniline (Chem.), a dyestuff produced artificially by
      the oxidation of commercial aniline, and the first
      discovered of the so-called coal-tar, or aniline, dyes. It
      consists of the sulphate of mauve["i]ne, and is a dark
      brown or bronze amorphous powder, which dissolves to a
      beatiful purple color. Called also aniline purple,
      violine, Perkin's mauve, etc.
      [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
colorful \colorful\ adj.
   1. having striking color. Opposite of colorless.
   Note: [Narrower terms: changeable, chatoyant, iridescent,
         shot; deep, rich; flaming; fluorescent, glowing;
         prismatic; psychedelic; red, ruddy, flushed,
         empurpled]
   Syn: colourful.
        [WordNet 1.5]
   2. striking in variety and interest. Opposite of colorless
      or dull. [Narrower terms: brave, fine, gay, glorious;
      flamboyant, resplendent, unrestrained; flashy, gaudy,
      jazzy, showy, snazzy, sporty; picturesque]
      [WordNet 1.5]
   3. having color or a certain color; not black, white or grey;
      as, colored crepe paper. Opposite of colorless and
      monochrome.
   Note: [Narrower terms: tinted; touched, tinged; amber,
         brownish-yellow, yellow-brown; amethyst; auburn,
         reddish-brown; aureate, gilded, gilt, gold, golden;
         azure, cerulean, sky-blue, bright blue; bicolor,
         bicolour, bicolored, bicoloured, bichrome; blue,
         bluish, light-blue, dark-blue; blushful,
         blush-colored, rosy; bottle-green; bronze, bronzy;
         brown, brownish, dark-brown; buff; canary,
         canary-yellow; caramel, caramel brown; carnation;
         chartreuse; chestnut; dun; earth-colored,
         earthlike; fuscous; green, greenish, light-green,
         dark-green; jade, jade-green; khaki; lavender,
         lilac; mauve; moss green, mosstone; motley,
         multicolor, culticolour, multicolored, multicoloured,
         painted, particolored, particoloured, piebald, pied,
         varicolored, varicoloured; mousy, mouse-colored;
         ocher, ochre; olive-brown; olive-drab; olive;
         orange, orangish; peacock-blue; pink, pinkish;
         purple, violet, purplish; red, blood-red, carmine,
         cerise, cherry, cherry-red, crimson, ruby, ruby-red,
         scarlet; red, reddish; rose, roseate; rose-red;
         rust, rusty, rust-colored; snuff, snuff-brown,
         snuff-color, snuff-colour, snuff-colored,
         snuff-coloured, mummy-brown, chukker-brown; sorrel,
         brownish-orange; stone, stone-gray; straw-color,
         straw-colored, straw-coloured; tan; tangerine;
         tawny; ultramarine; umber; vermilion,
         vermillion, cinibar, Chinese-red; yellow, yellowish;
         yellow-green; avocado; bay; beige; blae
         bluish-black or gray-blue); coral; creamy; cress
         green, cresson, watercress; hazel; honey,
         honey-colored; hued(postnominal); magenta;
         maroon; pea-green; russet; sage, sage-green;
         sea-green] [Also See: chromatic, colored, dark,
         light.]
   Syn: colored, coloured, in color(predicate).
        [WordNet 1.5]
WordNet (r) 3.0 (2006):
mauve
    adj 1: of a pale to moderate greyish violet color
    n 1: a moderate purple
Moby Thesaurus II by Grady Ward, 1.0:
22 Moby Thesaurus words for "mauve":
   amethystine, lavender, lilac, livid, magenta, mulberry, orchid,
   pansy-purple, plum-colored, plum-purple, purple, purplescent,
   purplish, purply, purpurate, purpure, purpureal, purpurean,
   purpureous, raisin-colored, violaceous, violet