The Collaborative International Dictionary of English v.0.48:

Dash \Dash\ (d[a^]sh), v. t. [imp. & p. p. Dashed; p. pr. &
   vb. n. Dashing.] [Of. Scand. origin; cf. Dan daske to beat,
   strike, Sw. & Icel. daska, Dan. & Sw. dask blow.]
   1. To throw with violence or haste; to cause to strike
      violently or hastily; -- often used with against.
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            If you dash a stone against a stone in the botton of
            the water, it maketh a sound.         --Bacon.
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   2. To break, as by throwing or by collision; to shatter; to
      crust; to frustrate; to ruin.
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            Thou shalt dash them in pieces like a potter's
            vessel.                               --Ps. ii. 9.
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            A brave vessel, . . .
            Dashed all to pieces.                 --Shak.
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            To perplex and dash
            Maturest counsels.                    --Milton.
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   3. To put to shame; to confound; to confuse; to abash; to
      depress. --South.
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            Dash the proud gamester in his gilded car. --Pope.
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   4. To throw in or on in a rapid, careless manner; to mix,
      reduce, or adulterate, by throwing in something of an
      inferior quality; to overspread partially; to bespatter;
      to touch here and there; as, to dash wine with water; to
      dash paint upon a picture.
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            I take care to dash the character with such
            particular circumstance as may prevent ill-natured
            applications.                         --Addison.
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            The very source and fount of day
            Is dashed with wandering isles of night. --Tennyson.
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   5. To form or sketch rapidly or carelessly; to execute
      rapidly, or with careless haste; -- with off; as, to dash
      off a review or sermon.
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   6. To erase by a stroke; to strike out; knock out; -- with
      out; as, to dash out a word.
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The Collaborative International Dictionary of English v.0.48:

Dashing \Dash"ing\, a.
   Bold; spirited; showy.
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         The dashing and daring spirit is preferable to the
         listless.                                --T. Campbell.
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WordNet (r) 3.0 (2006):

dashing
    adj 1: lively and spirited; "a dashing hero" [syn: dashing,
           gallant]
    2: marked by up-to-dateness in dress and manners; "a dapper
       young man"; "a jaunty red hat" [syn: dapper, dashing,
       jaunty, natty, raffish, rakish, spiffy, snappy,
       spruce]

Moby Thesaurus II by Grady Ward, 1.0:

114 Moby Thesaurus words for "dashing":
   agile, alert, animate, animated, brave, bravura, braw, breakneck,
   bright, chic, chichi, classy, clothes-conscious, cosmopolitan,
   dapper, daring, double-quick, dressed to advantage,
   dressed to kill, dressy, dynamic, eagle-winged, elegant, energetic,
   exclusive, exhibitionistic, expeditious, express, exquisite,
   fashionable, fast, flamboyant, flashing, flashy, flaunting, fleet,
   flying, frilly, frothy, gallant, galloping, gay, genteel,
   glittering, hair-trigger, hasty, headlong, hustling, impetuous,
   jaunty, jazzy, keen, light of heel, light-footed, lively,
   mercurial, modish, natty, neat, nifty, nimble, nimble-footed,
   nobby, ostentatious, peppy, posh, precipitate, pretentious, prompt,
   quick, quick as lightning, quick as thought, rakish, rapid,
   recherche, reckless, ritzy, rousing, running, sharp, showy, sleek,
   smart, smug, snappy, snazzy, soigne, soignee, sophisticated,
   spanking, speedy, spiffy, spirited, splashy, splurgy, sporty,
   spruce, style-conscious, stylish, swank, swanky, swell, swift,
   swish, trendy, tricksy, trig, trim, vigorous, vivacious,
   well-dressed, well-groomed, winged, with-it