Adjective : a feasible plan. ,a feasible theory. ,a road feasible for travel.    From Dictionary.com. 

Who first suggested the feasibleness of a westward route to the Indies?.    From Wordnik.com.  [The Discovery of America Vol. 1 (of 2) with some account of Ancient America and the Spanish Conquest] Reference

For surely they have not yet convinced the world of the feasibleness and truth of their propositions, by any manifest transcriptions of them upon their lives.    From Wordnik.com.  [Sermons Preached Upon Several Occasions. Vol. V.] Reference

I have now so far cleared the way as to be in a fair position to enter with feasibleness into an investigation of the Annals, with the view of proving that it was not written by Tacitus.    From Wordnik.com.  [Tacitus and Bracciolini The Annals Forged in the XVth Century] Reference

The cardinal facts are 1, that the need for some such scheme was suggested in 1471, by the discovery that the Guinea coast extended south of the equator; 2, that by 1474 advice had been sought from Toscanelli by the king of Portugal, and not very long after 1474 by Columbus; 3, that upon Toscanelli's letters and map, amended by the Ptolemaic estimate of the earth's size and by the authority of passages quoted in the book of Alliacus (one of which was a verse from the Apocrypha), Columbus based his firm conviction of the feasibleness of the western route.    From Wordnik.com.  [The Discovery of America Vol. 1 (of 2) with some account of Ancient America and the Spanish Conquest] Reference