advantageable

From advantage +‎ -able.

advantageable (comparative more advantageable, superlative most advantageable)

1. Providing an advantage; helpful to the advancement of a cause.
   • 1599 (date written), William Shakespeare, “The Life of Henry the Fift”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act V, scene ii]:

     Augment, or alter, as your wisdoms best
     Shall see advantageable for our dignity,
     Any thing in or out of our demands,
     And we'll consign thereto.