1. Lacking, or not bearing, fruit; barren; destitute of offspring; as, a fruitless tree or shrub; a fruitless marriage.
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)
Synonym: useless, barren, unprofitable, abortive, ineffectual, vain, idle, profitless. See useless.