Lewis & Short

in-fructŭōsus, a, um, adj., unfruitful (post-Aug.).

  1. I. Lit.: vites, Col. Arb. 8, 4: cultura, id. 11, 2, 32.
  2. II. Trop., fruitless, useless: preces, Plin. Ep. 8, 23: epistula, Sen. Contr. 3, 19 fin.: militia, Tac. H. 1, 51.
    Adv.: infructŭōsē, fruitlessly, uselessly, Hier. Ep. 12, n. 16; Aug. Ep. 67, n. 6.
    Comp., Sid. Ep. 1, 9.