[syn: golden, favorable, favourable, lucky, prosperous]
The Collaborative International Dictionary of English v.0.48:
Favorable \Fa"vor*a*ble\ (f[=a]"v[~e]r*[.a]*b'l), a. [Written
   also favourable.] [F. favorable, L. favorabilis favored,
   popular, pleasing, fr. favor. See Favor, n.]
   1. Full of favor; favoring; manifesting partiality; kind;
      propitious; friendly.
      [1913 Webster]
            Lend favorable ears to our request.   --Shak.
      [1913 Webster]
            Lord, thou hast been favorable unto thy land. --Ps.
                                                  lxxxv. 1.
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   2. Conducive; contributing; tending to promote or facilitate;
      advantageous; convenient.
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            A place very favorable for the making levies of men.
                                                  --Clarendon.
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            The temper of the climate, favorable to generation,
            health, and long life.                --Sir W.
                                                  Temple.
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   3. Beautiful; well-favored. [Obs.] --Spenser. --
      Fa"vora*ble*ness, n. -- Fa"vor*a*bly, adv.
      [1913 Webster]
            The favorableness of the present times to all
            exertions in the cause of liberty.    --Burke.
      [1913 Webster]
WordNet (r) 3.0 (2006):
favourable
    adj 1: encouraging or approving or pleasing; "a favorable
           reply"; "he received a favorable rating"; "listened with
           a favorable ear"; "made a favorable impression" [syn:
           favorable, favourable] [ant: unfavorable,
           unfavourable]
    2: (of winds or weather) tending to promote or facilitate; "the
       days were fair and the winds were favorable" [syn:
       favorable, favourable] [ant: unfavorable,
       unfavourable]
    3: occurring at a convenient or suitable time; "an opportune
       time to receive guests" [syn: favorable, favourable]
    4: presaging or likely to bring good luck; "a favorable time to
       ask for a raise"; "lucky stars"; "a prosperous moment to make
       a decision" [syn: golden, favorable, favourable,
       lucky, prosperous]