effectual Antonyms

ineffectual preparatory unfruitful unsuccessful useless vain valueless weak worthless unnecessary toothless thankless successless profitless purportless resultless rewardless senseless sinful sisyphean slavish sterile unprofitable unavailing unproductive not worth the candle no use on the fritz self-defeating uneffective unhelpful unremunerative unrewarding counterproductive to no purpose in vain junky undynamic unassertive anticlimactic meaningless no-win dysfunctional unenterprising nonsurgical not helpful pointless abortive futile gainless