effectual Antonyms

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