Not bearing fruit; destitute of fruit or offspring: as, a fruitless plant; a fruitless marriage.Productive of or attended by no advantage or good result; ineffective; useless; idle: as, a fruitless attempt; a, fruitless controversy.Synonyms Barren, unprofitable, profitless Ineffectual, Unavailing, etc. (see useless); vain, idle, abortive, bootless, futile.