The Collaborative International Dictionary of English v.0.48:
Fructuous \Fruc"tu*ous\, a. [L. fructuosus: cf, F. fructueux.]
Fruitful; productive; profitable. [Obs.]
[1913 Webster]
Nothing fructuous or profitable. --Chaucer.
-- Fruc"tu*ous*ly, adv. -- Fruc"tu*ous*ness, n. [Obs.]
[1913 Webster]
Moby Thesaurus II by Grady Ward, 1.0:
36 Moby Thesaurus words for "fructuous":
advantageous, advisable, appropriate, becoming, befitting,
congruous, convenient, decent, desirable, expedient, favorable,
feasible, felicitous, fit, fitten, fitting, good, happy, likely,
meet, opportune, politic, profitable, proper, recommendable, right,
seasonable, seemly, sortable, suitable, timely, to be desired,
useful, well-timed, wise, worthwhile