資料來源 : pyDict

無效地;無益地

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Fruitless \Fruit"less\, a.
   1. Lacking, or not bearing, fruit; barren; destitute of
      offspring; as, a fruitless tree or shrub; a fruitless
      marriage. --Shak.

   2. Productive of no advantage or good effect; vain; idle;
      useless; unprofitable; as, a fruitless attempt; a
      fruitless controversy.

            They in mutual accusation spent The fruitless hours.
                                                  --Milton.

   Syn: Useless; barren; unprofitable; abortive; ineffectual;
        vain; idle; profitless. See {Useless}. --
        {Fruit"less*ly}, adv. -- {Fruit"lness*ness}, n.

資料來源 : WordNet®

fruitlessly
     adv : in an unproductive manner [syn: {unproductively}, {unprofitably}]
           [ant: {productively}, {productively}, {productively}]