All fruitless antonyms

adj fruitless

• effectual — producing or capable of producing an intended effect; adequate.
• fruitful — producing good results; beneficial; profitable: fruitful investigations.
• productive — having the power of producing; generative; creative: a productive effort.
• profitable — yielding profit; remunerative: a profitable deal.
• copious — A copious amount of something is a large amount of it.
• plentiful — existing in great plenty: Coal was plentiful, and therefore cheap, in that region.
• potent — (of a cross) having a crosspiece at the extremity of each arm: a cross potent.
• successful — achieving or having achieved success.
• useful — being of use or service; serving some purpose; advantageous, helpful, or of good effect: a useful member of society.
• effective — adequate to accomplish a purpose; producing the intended or expected result: effective teaching methods; effective steps toward peace.