ADJECTIVE (2)

1. giving an advantage;
- Example: "a contract advantageous to our country"
- Example: "socially advantageous to entertain often"

2. appropriate for achieving a particular end; implies a lack of concern for fairness;

The Collaborative International Dictionary of English v.0.48:

Advantageous \Ad`van*ta"geous\, a. [F. avantageux, fr.
   avantage.]
   Being of advantage; conferring advantage; gainful;
   profitable; useful; beneficial; as, an advantageous position;
   trade is advantageous to a nation.
   [1913 Webster]

         Advabtageous comparison with any other country.
                                                  --Prescott.
   [1913 Webster]

         You see . . . of what use a good reputation is, and how
         swift and advantageous a harbinger it is, wherever one
         goes.                                    --Chesterfield.
   [1913 Webster]

WordNet (r) 3.0 (2006):

advantageous
    adj 1: giving an advantage; "a contract advantageous to our
           country"; "socially advantageous to entertain often"
           [ant: disadvantageous]
    2: appropriate for achieving a particular end; implies a lack of
       concern for fairness

Moby Thesaurus II by Grady Ward, 1.0:

107 Moby Thesaurus words for "advantageous":
   acceptable, advisable, agreeable, appropriate, auspicious,
   banausic, becoming, befitting, beneficial, benevolent, bon, bonny,
   brave, braw, breadwinning, bueno, capital, cogent, commendable,
   commodious, conducive, congruous, contributory, convenient, decent,
   desirable, elegant, employable, estimable, excellent, expedient,
   fair, famous, fat, favorable, favoring, feasible, felicitous, fine,
   fit, fitten, fitting, fructuous, functional, gainful, good,
   good for, goodly, grand, happy, healthy, helpful, in the black,
   instrumental, kind, laudable, likely, lucrative, meet, moneymaking,
   nice, noble, of general utility, of help, of service, of use,
   opportune, paying, pleasant, pleasing, politic, practical,
   pragmatical, productive, profitable, proper, propitious,
   recommendable, regal, remedial, remunerative, right, royal,
   salutary, satisfactory, satisfying, seasonable, seemly,
   serviceable, skillful, sortable, sound, splendid, suitable, timely,
   to be desired, toward, useful, utilitarian, valid, valuable,
   very good, virtuous, well-paying, well-timed, wise, worthwhile