Source : Webster's Revised Unabridged Dictionary (1913)

Bold \Bold\ (b[=o]ld), a. [OE. bald, bold, AS. bald, beald; akin
   to Icel. ballr, OHG. bald, MHG. balt, D. boud, Goth.
   bal[thorn]ei boldness, It. baldo. In Ger. there remains only
   bald, adv. soon. Cf. {Bawd}, n.]
   1. Forward to meet danger; venturesome; daring; not timorous
      or shrinking from risk; brave; courageous.

            Throngs of knights and barons bold.   --Milton.

   2. Exhibiting or requiring spirit and contempt of danger;
      planned with courage; daring; vigorous. ``The bold design
      leased highly.'' --Milton.

   3. In a bad sense, too forward; taking undue liberties; over
      assuming or confident; lacking proper modesty or
      restraint; rude; impudent.

            Thou art too wild, too rude and bold of voice.
                                                  --Shak.

   4. Somewhat overstepping usual bounds, or conventional rules,
      as in art, literature, etc.; taking liberties in
      composition or expression; as, the figures of an author
      are bold. ``Bold tales.'' --Waller.

            The cathedral church is a very bold work. --Addison.

   5. Standing prominently out to view; markedly conspicuous;
      striking the eye; in high relief.

            Shadows in painting . . . make the figure bolder.
                                                  --Dryden.

   6. Steep; abrupt; prominent.

            Where the bold cape its warning forehead rears.
                                                  --Trumbull.

Bold \Bold\, v. t.
   To make bold or daring. [Obs.] --Shak.

Bold \Bold\, v. i.
   To be or become bold. [Obs.]

Source : WordNet®

bold
     adj 1: fearless and daring; "bold settlers on some foreign shore";
            "a bold speech"; "a bold adventure" [ant: {timid}]
     2: clear and distinct; "bold handwriting"; "a figure carved in
        bold relief"; "a bold design"
     3: very steep; having a prominent and almost vertical front; "a
        bluff headland"; "where the bold chalk cliffs of England
        rise"; "a sheer descent of rock" [syn: {bluff}, {sheer}]

bold
     n : a typeface with thick heavy lines [syn: {boldface}, {bold
         face}]