Advantageous, a.
Etymology: [F. avantageux, fr. avantage.]
Being of advantage; conferring advantage; gainful; profitable; useful; beneficial; as, an advantageous position; trade is advantageous to a nation. Advabtageous comparison with any other country. Prescott. You see . . . of what use a good reputation is, and how swift and advantageous a harbinger it is, wherever one goes. Chesterfield.
Shades of meaning
Fernald lists advantageous only as an antonym, under pernicious, vain.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given