The Collaborative International Dictionary of English v.0.48:

Bonny \Bon"ny\ (-n[y^]), a. [Spelled bonnie by the Scotch.]
   [OE. boni, prob. fr. F. bon, fem. bonne, good, fr. L. bonus
   good. See Bounty, and cf. Bonus, Boon.]
   1. Handsome; beautiful; pretty; attractively lively and
      graceful.
      [1913 Webster]

            Till bonny Susan sped across the plain. --Gay.
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            Far from the bonnie banks of Ayr.     --Burns.
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   2. Gay; merry; frolicsome; cheerful; blithe.
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            Be you blithe and bonny.              --Shak.
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            Report speaks you a bonny monk, that would hear the
            matin chime ere he quitted his bowl.  --Sir W.
                                                  Scott.
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The Collaborative International Dictionary of English v.0.48:

Bonny \Bon"ny\, n. (Mining)
   A round and compact bed of ore, or a distinct bed, not
   communicating with a vein.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bonny
    adj 1: very pleasing to the eye; "my bonny lass"; "there's a
           bonny bay beyond"; "a comely face"; "young fair maidens"
           [syn: bonny, bonnie, comely, fair, sightly]

Moby Thesaurus II by Grady Ward, 1.0:

79 Moby Thesaurus words for "bonny":
   Junoesque, advantageous, agreeable, amply endowed, attractive,
   auspicious, beauteous, beautiful, becoming, beneficial, benevolent,
   bon, boulevardier, braw, bueno, built, built for comfort, buxom,
   callipygian, cogent, comely, commendable, curvaceous, curvy,
   elegant, estimable, excellent, expedient, fair, famous, favorable,
   fine, goddess-like, good, good-looking, goodly, grand, handsome,
   healthy, helpful, high liver, kind, laudable, likely, lovely,
   lovely to behold, man-about-town, nice, noble, personable,
   pleasant, pleasing, pneumatic, presentable, pretty, profitable,
   pulchritudinous, regal, royal, shapely, sightly, skillful, slender,
   sound, splendid, sport, stacked, statuesque, useful, valid,
   very good, virtuous, well-built, well-favored, well-formed,
   well-made, well-proportioned, well-shaped, well-stacked